ABSTRACT We aimed to characterize the satisfaction and perceptions of the residents of Lima about different aspects of urban life that can affect their quality of life and health, identifying differences by socioeconomic status (SES) and changes over time. A secondary data analysis of the “Lima Cómo Vamos” survey was conducted between 2010 and 2019. Results are reported through percentages, with differences between SES for each year and between years. In 2019, satisfaction and perceptions were mostly unfavorable, and have decreased by up to 30% over time. People with lower SES had more unfavorable evaluations and with greater reductions over time. This dissatisfaction and unfavorable perceptions reveal deficiencies in public services and urban conditions that could negatively affect the quality of life and health, making it necessary to design and implement policies that reduce socioeconomic gaps and improve the health of Lima citizens.

RESUMEN Se buscó caracterizar la satisfacción y percepciones de los residentes de Lima Metropolitana sobre distintos aspectos de la ciudad que pueden afectar su calidad de vida y salud, identificando diferencias por nivel socioeconómico (NSE) y cambios en el tiempo. Se realizó un análisis secundario de la Encuesta «Lima Cómo Vamos» entre 2010 y 2019, reportando los resultados mediante porcentajes, con diferencias entre NSE para cada año y entre años. En 2019 la satisfacción y percepciones eran mayoritariamente desfavorables, y han disminuido hasta en 30 puntos porcentuales con el tiempo. Las personas de NSE más bajos tenían valoraciones más desfavorables y con mayores reducciones en el tiempo. Esta insatisfacción y percepciones desfavorables revelan deficiencias en servicios públicos y condiciones urbanas que podrían afectar negativamente la calidad de vida y salud, haciendo necesarias políticas que reduzcan las brechas socioeconómicas y mejoren la salud de los ciudadanos de Lima Metropolitana.

ABSTRACT We aimed to characterize the satisfaction and perceptions of the residents of Lima about different aspects of urban life that can affect their quality of life and health, identifying differences by socioeconomic status (SES) and changes over time. A secondary data analysis of the “Lima Cómo Vamos” survey was conducted between 2010 and 2019. Results are reported through percentages, with differences between SES for each year and between years. In 2019, satisfaction and perceptions were mostly unfavorable, and have decreased by up to 30% over time. People with lower SES had more unfavorable evaluations and with greater reductions over time. This dissatisfaction and unfavorable perceptions reveal deficiencies in public services and urban conditions that could negatively affect the quality of life and health, making it necessary to design and implement policies that reduce socioeconomic gaps and improve the health of Lima citizens.

RESUMEN Se buscó caracterizar la satisfacción y percepciones de los residentes de Lima Metropolitana sobre distintos aspectos de la ciudad que pueden afectar su calidad de vida y salud, identificando diferencias por nivel socioeconómico (NSE) y cambios en el tiempo. Se realizó un análisis secundario de la Encuesta «Lima Cómo Vamos» entre 2010 y 2019, reportando los resultados mediante porcentajes, con diferencias entre NSE para cada año y entre años. En 2019 la satisfacción y percepciones eran mayoritariamente desfavorables, y han disminuido hasta en 30 puntos porcentuales con el tiempo. Las personas de NSE más bajos tenían valoraciones más desfavorables y con mayores reducciones en el tiempo. Esta insatisfacción y percepciones desfavorables revelan deficiencias en servicios públicos y condiciones urbanas que podrían afectar negativamente la calidad de vida y salud, haciendo necesarias políticas que reduzcan las brechas socioeconómicas y mejoren la salud de los ciudadanos de Lima Metropolitana.

ABSTRACT Objectives. To assess how and in what extent the electronic nicotine delivery systems (ENDS) use substituted the consumption of traditional combustible cigarettes (c-cigarettes, c-cig). Materials and Methods. We performed a systematic review of the literature up to August 2019 in scientific databases. Primary outcomes were proportion of complete or partial substitution of conventional to electronic cigarettes and related economic aspects. Secondary outcomes were odds ratio of substitution and country-wise time trends. Results. We retrieved 3,628 references and included 49 studies, providing economic and epidemiological data. Economic studies of cross-price elasticity showed that combustible cigarettes are partially substitutable for electronic cigarettes. Most studies reported that electronic cigarettes consumption prevalence increased over time. Three studies reported a significant reduction of combustible cigarettes consumed per day among dual users (combustible- plus electronic- cigarettes users) versus combustible-cigarettes users. The pooled adjusted odds ratio of quitting combustible cigarettes among electronic cigarettes users versus never or past electronic cigarettes (e-cigarettes, e-cig) users was 1.19 (95% confidence interval 1.09 to 1.30; heterogeneity score 0%). Longitudinal studies showed globally a growing prevalence of electronic cigarettes use, mainly in adolescents. A negative relationship between consumption and price increase of electronic and combustible cigarettes was found. Conclusion. The chance of quitting smoking combustible cigarettes among current electronic nicotine delivery systems users was increased with respect to never- or past- electronic nicotine delivery systems users. Economic studies reported that electronic cigarette is partially substitutable for combustible cigarettes.

RESUMEN Objetivos. Evaluar cómo y en qué medida se produce un intercambio desde los cigarrillos convencionales (CC) a los sistemas electrónicos de administración de nicotina (SEAN). Materiales y métodos. Se realizó una revisión sistemática hasta agosto de 2019. El desenlace primario fue la proporción de un intercambio completo o parcial de CC a los SEAN y sus aspectos económicos. Los desenlaces secundarios como medidas de resultado fueron la probabilidad de intercambio y la tendencia en el intercambio por países. Resultados. Se encontraron 3628 referencias y se incluyeron 49 estudios con datos epidemiológicos y económicos. Los estudios económicos sobre la elasticidad cruzada de precios mostraron que los CC son parcialmente intercambiables por SEAN. La mayoría de los estudios reportaron que la prevalencia del consumo de cigarrillos electrónicos se incrementó con el tiempo. Tres estudios reportaron una reducción significativa de los CC consumidos por día entre fumadores duales (convencionales más SEAN) en comparación con los consumidores de CC. El odds ratio ajustado y combinado de dejar los CC entre consumidores de SEAN en comparación con quienes nunca consumieron o lo hicieron en el pasado fue de 1,19 (IC95%: 1,09-1,30; heterogeneidad 0%). Los estudios longitudinales mostraron una creciente prevalencia del uso de cigarrillos electrónicos, principalmente en adolescentes. Se encontró una relación negativa entre el consumo y aumento de precio de CC y electrónicos. Conclusión. La probabilidad de dejar de fumar CC entre consumidores habituales de SEAN se incrementó respecto a los consumidores que nunca o que solían consumir SEAN. Estudios económicos reportaron que los cigarrillos electrónicos son parcialmente intercambiables por los CC.

ABSTRACT Objectives. To assess how and in what extent the electronic nicotine delivery systems (ENDS) use substituted the consumption of traditional combustible cigarettes (c-cigarettes, c-cig). Materials and Methods. We performed a systematic review of the literature up to August 2019 in scientific databases. Primary outcomes were proportion of complete or partial substitution of conventional to electronic cigarettes and related economic aspects. Secondary outcomes were odds ratio of substitution and country-wise time trends. Results. We retrieved 3,628 references and included 49 studies, providing economic and epidemiological data. Economic studies of cross-price elasticity showed that combustible cigarettes are partially substitutable for electronic cigarettes. Most studies reported that electronic cigarettes consumption prevalence increased over time. Three studies reported a significant reduction of combustible cigarettes consumed per day among dual users (combustible- plus electronic- cigarettes users) versus combustible-cigarettes users. The pooled adjusted odds ratio of quitting combustible cigarettes among electronic cigarettes users versus never or past electronic cigarettes (e-cigarettes, e-cig) users was 1.19 (95% confidence interval 1.09 to 1.30; heterogeneity score 0%). Longitudinal studies showed globally a growing prevalence of electronic cigarettes use, mainly in adolescents. A negative relationship between consumption and price increase of electronic and combustible cigarettes was found. Conclusion. The chance of quitting smoking combustible cigarettes among current electronic nicotine delivery systems users was increased with respect to never- or past- electronic nicotine delivery systems users. Economic studies reported that electronic cigarette is partially substitutable for combustible cigarettes.

RESUMEN Objetivos. Evaluar cómo y en qué medida se produce un intercambio desde los cigarrillos convencionales (CC) a los sistemas electrónicos de administración de nicotina (SEAN). Materiales y métodos. Se realizó una revisión sistemática hasta agosto de 2019. El desenlace primario fue la proporción de un intercambio completo o parcial de CC a los SEAN y sus aspectos económicos. Los desenlaces secundarios como medidas de resultado fueron la probabilidad de intercambio y la tendencia en el intercambio por países. Resultados. Se encontraron 3628 referencias y se incluyeron 49 estudios con datos epidemiológicos y económicos. Los estudios económicos sobre la elasticidad cruzada de precios mostraron que los CC son parcialmente intercambiables por SEAN. La mayoría de los estudios reportaron que la prevalencia del consumo de cigarrillos electrónicos se incrementó con el tiempo. Tres estudios reportaron una reducción significativa de los CC consumidos por día entre fumadores duales (convencionales más SEAN) en comparación con los consumidores de CC. El odds ratio ajustado y combinado de dejar los CC entre consumidores de SEAN en comparación con quienes nunca consumieron o lo hicieron en el pasado fue de 1,19 (IC95%: 1,09-1,30; heterogeneidad 0%). Los estudios longitudinales mostraron una creciente prevalencia del uso de cigarrillos electrónicos, principalmente en adolescentes. Se encontró una relación negativa entre el consumo y aumento de precio de CC y electrónicos. Conclusión. La probabilidad de dejar de fumar CC entre consumidores habituales de SEAN se incrementó respecto a los consumidores que nunca o que solían consumir SEAN. Estudios económicos reportaron que los cigarrillos electrónicos son parcialmente intercambiables por los CC.

Resumo Objetivo Determinar a adequação do cumprimento dos cuidados pré-natais (CPN) por mulheres grávidas no Peru e identificar os fatores associados. Métodos Foi realizado um estudo analítico transversal dos dados da Pesquisa Demográfica e de Saúde da Família Peruana de 2019 (Encuesta Demográfica y de Salud Familiar, ENDES, em espanhol). A variável dependente foi conformidade adequada coma CPN (fornecida por profissionais de saúde qualificados; primeira visita CPN durante o primeiro trimestre de gravidez; seis ou mais visitas CPN durante a gravidez; visitas CPN com conteúdo apropriado) por mulheres de 15 a 49 anos em seu último parto nos cinco anos anteriores à pesquisa. Os índices de prevalência bruta e ajustada e seus intervalos de confiança de 95% foram calculados usando um modelo de regressão log-binomial. Resultados Foi analisado um total de 18.386 mulheres, das quais 35,0% cumpriram adequadamente o CPN. A menor proporção de conformidade foi encontrada com o conteúdo de ANC (42,6%). Fatores sociodemográficos e aqueles relacionados à gravidez, como estar na faixa etária de 20 a 34 anos e 35 a 49 anos, ter educação secundária ou superior, pertencer a um quintil de riqueza da população que não a mais pobre, ser da região da selva, não ser de etnia nativa, ter um segundo ou terceiro gravidez, e tendo uma gravidez desejada, aumentou a probabilidade de apresentar conformidade adequada com CPN. Conclusão Apenas 3 em cada 10 mulheres no Peru mostraram conformidade adequada com o CPN. O cumprimento do conteúdo do CPN deve ser melhorado, e estratégias devem ser desenvolvidas para aumentar a proporção de cumprimento adequado com o CPN.

Abstract Objective To determine the adequacy of compliance with antenatal care (ANC) by pregnant women in Peru and to identify the associated factors. Methods An analytical cross-sectional study of data from the 2019 Peruvian Demographic and Family Health Survey (Encuesta Demográfica y de Salud Familiar, ENDES, in Spanish) was conducted. The dependent variable was adequate compliance with ANC (provided by skilled health care professionals; first ANC visit during the first trimester of pregnancy; six or more ANC visits during pregnancy; ANC visits with appropriate content) by women aged 15 to 49 years in their last delivery within the five years prior to the survey. Crude and adjusted prevalence ratios and their 95% confidence intervals were calculated using a log-binomial regression model. Results A total of 18,386 women were analyzed, 35.0% of whom adequately complied with ANC. The lowest proportion of compliance was found with the content of ANC (42.6%). Sociodemographic factors and those related to pregnancy, such as being in the age groups of 20 to 34 years and 35 to 49 years, havingsecondaryor higher education, belonging to a wealth quintile of the population other than the poorest, being from the Amazon region, not being of native ethnicity, having a second or third pregnancy, and having a desired pregnancy, increased the probability of presenting adequate compliance with ANC. Conclusion Only 3 out of 10women in Peru showed adequate compliancewith ANC. Compliance with the content of ANC must be improved, and strategies must be developed to increase the proportion of adequate compliance with ANC.

RESUMO: Objetivo: Identificar os fatores ambientais presentes em áreas com alta densidade de acidentes de trânsito rodoviário (ATR) em León, Nicarágua. Métodos: Foram incluídos na análise todos os acidentes registrados pelo Departamento de Polícia da cidade de León de janeiro a junho de 2017. Georreferenciamos todos os acidentes e coletamos dados dos elementos ambientais em um perímetro de 20 metros do local até os acidentes ocorridos por meio de um instrumento de coleta de dados pré-testado. Foi especificado um modelo de regressão de Poisson para estimar as razões das taxas de incidência (TI) e intervalos de confiança de 95% (IC95%) para determinar os fatores ambientais associados à incidência do evento. Para identificar áreas com alta, média e baixa ocorrência de acidentes, estimamos a densidade do núcleo em torno dos pontos onde o ATR ocorreu. Resultados: Dos 667 acidentes registrados, 90% envolveram homens com idades entre 15 e 40 anos, e os acidentes de motocicleta representaram 60% dos ferimentos ou mortes. Os fatores ambientais que foram associados positivamente aos ATR incluíram boas condições da estrada (TI ajustada = 1,36; IC95% 1,13 - 1,63) e a existência de ciclovias (TI ajustada = 1,64; IC95% 1,29 - 2,10). Características ambientais associadas a velocidades mais altas e acidentes mais pesados podem aumentar a incidência deles. Conclusão: Constatamos que os centros comerciais ou turísticos com tráfego intenso são três áreas com alta densidade de acidentes. As autoridades locais podem usar essas descobertas para promover medidas de segurança no trânsito em áreas de alta incidência na cidade de León.

ABSTRACT: Objective: To identify environmental factors present in areas with high density of road traffic accidents (RTA) in Leon, Nicaragua. Methods: The analysis included all accidents recorded by the Police Department in León City, from January to June 2017. All crashes were georeferenced, and data were collected from the environment elements within a perimeter of 20 meters from the site in which accidents occurred with a pre-tested data collection instrument. We specified a Poisson regression model to estimate incidence rate ratios (IRR) and 95% confidence intervals (CI) to determine environmental factors associated with the event incidence. For the identification areas with high, medium, and low occurrences of crashes, kernel density around points in which RTA occurred were estimated. Results: Out of 667 recorded crashes, 90% involved men aged 15-40, and motorcycle accidents represented 60% of injuries or deaths. Environmental factors that were positively associated with RTA included good road conditions (adjusted IRR = 1.36, 95%CI 1.13 - 1.63) and the existence of bicycle lanes (adjusted IRR = 1.64, 95%CI 1.29 - 2.10). Environmental characteristics associated with higher speeds and heavier accidents can increase their incidence. Conclusion: We found that high-foot-traffic commercial or touristic centers are three areas with high density of crashes. Local authorities can use these findings to promote road safety measures in high-incidence areas in León City.

RESUMO: Objetivo: Identificar os fatores ambientais presentes em áreas com alta densidade de acidentes de trânsito rodoviário (ATR) em León, Nicarágua. Métodos: Foram incluídos na análise todos os acidentes registrados pelo Departamento de Polícia da cidade de León de janeiro a junho de 2017. Georreferenciamos todos os acidentes e coletamos dados dos elementos ambientais em um perímetro de 20 metros do local até os acidentes ocorridos por meio de um instrumento de coleta de dados pré-testado. Foi especificado um modelo de regressão de Poisson para estimar as razões das taxas de incidência (TI) e intervalos de confiança de 95% (IC95%) para determinar os fatores ambientais associados à incidência do evento. Para identificar áreas com alta, média e baixa ocorrência de acidentes, estimamos a densidade do núcleo em torno dos pontos onde o ATR ocorreu. Resultados: Dos 667 acidentes registrados, 90% envolveram homens com idades entre 15 e 40 anos, e os acidentes de motocicleta representaram 60% dos ferimentos ou mortes. Os fatores ambientais que foram associados positivamente aos ATR incluíram boas condições da estrada (TI ajustada = 1,36; IC95% 1,13 - 1,63) e a existência de ciclovias (TI ajustada = 1,64; IC95% 1,29 - 2,10). Características ambientais associadas a velocidades mais altas e acidentes mais pesados podem aumentar a incidência deles. Conclusão: Constatamos que os centros comerciais ou turísticos com tráfego intenso são três áreas com alta densidade de acidentes. As autoridades locais podem usar essas descobertas para promover medidas de segurança no trânsito em áreas de alta incidência na cidade de León.

ABSTRACT: Objective: To identify environmental factors present in areas with high density of road traffic accidents (RTA) in Leon, Nicaragua. Methods: The analysis included all accidents recorded by the Police Department in León City, from January to June 2017. All crashes were georeferenced, and data were collected from the environment elements within a perimeter of 20 meters from the site in which accidents occurred with a pre-tested data collection instrument. We specified a Poisson regression model to estimate incidence rate ratios (IRR) and 95% confidence intervals (CI) to determine environmental factors associated with the event incidence. For the identification areas with high, medium, and low occurrences of crashes, kernel density around points in which RTA occurred were estimated. Results: Out of 667 recorded crashes, 90% involved men aged 15-40, and motorcycle accidents represented 60% of injuries or deaths. Environmental factors that were positively associated with RTA included good road conditions (adjusted IRR = 1.36, 95%CI 1.13 - 1.63) and the existence of bicycle lanes (adjusted IRR = 1.64, 95%CI 1.29 - 2.10). Environmental characteristics associated with higher speeds and heavier accidents can increase their incidence. Conclusion: We found that high-foot-traffic commercial or touristic centers are three areas with high density of crashes. Local authorities can use these findings to promote road safety measures in high-incidence areas in León City.

ABSTRACT Objectives: To systematically review the effectiveness and safety of chlorine dioxide solution and chlorine derivatives used in the prevention or treatment of COVID-19. Methods: This review adheres to the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) and follows the guidelines provided in the Cochrane Handbook for Systematic Reviews of Interventions. A librarian developed and executed the search strategy; it was further reviewed by two of the authors and complemented by manual search. Randomized clinical trials, quasi-experimental studies, cohort studies, case-control studies, cross-sectional studies, and case reports were included; in vitro or animal studies were excluded. Abstract and full-text screening according to pre-defined eligibility criteria were performed by two reviewers independently using web application Rayyan QCRI. Disagreements on study selection were resolved by a third reviewer. The systematic review protocol was registered in PROSPERO (CRD42020200641). Results: Neither published nor pre-print studies evaluating the use of chlorine dioxide or derivatives on SARS-CoV-2 infection were identified. The only finding was an unpublished observational study registry which has no results released yet. Conclusions: To date, there are no scientific evidence to uphold the use of chlorine dioxide or derivatives as preventive or therapeutic agents against COVID-19.

RESUMEN Objetivos: Realizar una revisión sistemática acerca de la efectividad y seguridad del uso de dióxido de cloro y derivados del cloro, en la prevención o el tratamiento de la COVID-19. Materiales y métodos: Se siguieron las pautas internacionales de elaboración de revisiones sistemáticas de PRISMA y el Manual Cochrane para revisiones sistemáticas de intervenciones. La estrategia de búsqueda la desarrolló un bibliotecario y la revisaron dos de los autores. Se complementó la búsqueda electrónica con una búsqueda manual. Se incluyeron ensayos clínicos aleatorizados, estudios cuasiexperimentales, estudios de cohorte, estudios de casos y controles, estudios de corte transversal y reportes de casos; y se excluyeron estudios in vitro o realizados en animales. Dos revisores, de forma independiente, seleccionaron los estudios según los criterios de elegibilidad definidos, usando el aplicativo web Rayyan, en caso de discordancia se hizo partícipe a un tercer revisor. El protocolo de la revisión sistemática se registró en PROSPERO (CRD42020200641). Resultados: No se identificó ningún estudio publicado ni en proceso de publicación que haya evaluado el uso del dióxido de cloro o derivados del cloro, administrado por vía inhalatoria, oral o parenteral en humanos, como agente preventivo o terapéutico de la COVID-19 o en infecciones por otros coronavirus. Solo se identificó el registro de un único estudio catalogado como observacional que hasta ahora no tiene resultados. Conclusiones: A la fecha, no existe evidencia científica que apoye el uso del dióxido de cloro o derivados del cloro para prevenir o tratar la COVID-19.

Abstract This study aimed to describe the supply and advertising of foods and beverages both inside educational institutions and in their respective local areas in 15 public and private schools in Lima during 2019. Unbiased observations were recorded regarding the types of food available, the presence of octagons, and advertisements used in kiosks and cafeterias. Mobile food vendors were observed at the end of the school day. All schools offered processed products, 73.3% sold food with octagons, and 60% displayed advertising for processed and ultraprocessed foods. Mobile food vendors were observed in 86.7% of schools, several of which were found to sell ultraprocessed products. The results suggest an unhealthy food environment both inside and outside schools, and a noncompliance with current regulations. It is therefore necessary to improve the dissemination and supervision of the food policy, and develop strategies with schools to promote healthy eating.

Resumen El objetivo del estudio fue describir la oferta y la publicidad de alimentos y bebidas en instituciones educativas y entornos escolares de 15 colegios públicos y privados de Lima en 2019. Se realizaron observaciones inopinadas y se registraron los alimentos ofrecidos, la presencia de advertencias publicitarias, octógonos y la publicidad en quioscos y cafeterías. A la hora de salida se observó la venta ambulatoria de alimentos. Todas las escuelas ofrecían productos ultraprocesados, el 73,3% vendía alimentos con octógonos y el 60% tenía publicidad de alimentos procesados y ultraprocesados. En el 86,7% de los colegios había vendedores ambulantes de alimentos, varios de los alimentos eran productos ultraprocesados. Los resultados sugieren un ambiente alimentario no saludable dentro y alrededor de las escuelas, y el incumplimiento de la regulación actual. Resulta necesario mejorar la difusión y supervisión de la política alimentaria, y construir con las escuelas estrategias para promover una alimentación saludable.

Abstract Objective To evaluate the global productivity regarding original articles on maternal near-miss (MNM). Methods We conducted a bibliometric analysis of original articles published from 2008 to November 2019 in the journals indexed in the Scopus database. The averages of the number of articles by author, of the number of authors by article, of the number of citations by article, and the total number of documents with one or more authors were obtained. An analysis of the co-citation of authors and a co-occurrence analysis of the terms included in the titles and abstracts were performed and were presented as network visualization maps. Results A total of 326 original articles were analyzed. There was an increase in the number of articles (p < 0.001; average annual growth rate = 12.54%;). A total of 1,399 authors, an average number of articles per author of 4.29, with an index of authors per document of 0.23, and an index of co-authors per document of 8.16 were identified. A total of 85 countries contributed with original articles on MNM. Among the top ten countries regarding the contribution of articles, five were low and middle-income countries (LMICs). Brazil had the highest volume of production (31.1%;), followed by the US (11.5%;). Terms related to countries and the measurement of the rates and cases of MNM and the associated factors were found in recent years in the analysis of the co-occurrence of terms. Conclusion There was an increase in the production of original articles on MNM, with a significant participation of authors and institutions from LMICs, which reveals a growing interest in the use of MNM indicators to improve the quality of maternal health care.

ABSTRACT Objectives: To systematically review the effectiveness and safety of chlorine dioxide solution and chlorine derivatives used in the prevention or treatment of COVID-19. Methods: This review adheres to the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) and follows the guidelines provided in the Cochrane Handbook for Systematic Reviews of Interventions. A librarian developed and executed the search strategy; it was further reviewed by two of the authors and complemented by manual search. Randomized clinical trials, quasi-experimental studies, cohort studies, case-control studies, cross-sectional studies, and case reports were included; in vitro or animal studies were excluded. Abstract and full-text screening according to pre-defined eligibility criteria were performed by two reviewers independently using web application Rayyan QCRI. Disagreements on study selection were resolved by a third reviewer. The systematic review protocol was registered in PROSPERO (CRD42020200641). Results: Neither published nor pre-print studies evaluating the use of chlorine dioxide or derivatives on SARS-CoV-2 infection were identified. The only finding was an unpublished observational study registry which has no results released yet. Conclusions: To date, there are no scientific evidence to uphold the use of chlorine dioxide or derivatives as preventive or therapeutic agents against COVID-19.

RESUMEN Objetivos: Realizar una revisión sistemática acerca de la efectividad y seguridad del uso de dióxido de cloro y derivados del cloro, en la prevención o el tratamiento de la COVID-19. Materiales y métodos: Se siguieron las pautas internacionales de elaboración de revisiones sistemáticas de PRISMA y el Manual Cochrane para revisiones sistemáticas de intervenciones. La estrategia de búsqueda la desarrolló un bibliotecario y la revisaron dos de los autores. Se complementó la búsqueda electrónica con una búsqueda manual. Se incluyeron ensayos clínicos aleatorizados, estudios cuasiexperimentales, estudios de cohorte, estudios de casos y controles, estudios de corte transversal y reportes de casos; y se excluyeron estudios in vitro o realizados en animales. Dos revisores, de forma independiente, seleccionaron los estudios según los criterios de elegibilidad definidos, usando el aplicativo web Rayyan, en caso de discordancia se hizo partícipe a un tercer revisor. El protocolo de la revisión sistemática se registró en PROSPERO (CRD42020200641). Resultados: No se identificó ningún estudio publicado ni en proceso de publicación que haya evaluado el uso del dióxido de cloro o derivados del cloro, administrado por vía inhalatoria, oral o parenteral en humanos, como agente preventivo o terapéutico de la COVID-19 o en infecciones por otros coronavirus. Solo se identificó el registro de un único estudio catalogado como observacional que hasta ahora no tiene resultados. Conclusiones: A la fecha, no existe evidencia científica que apoye el uso del dióxido de cloro o derivados del cloro para prevenir o tratar la COVID-19.

ABSTRACT Objective : To evaluate the Peruvian scientific production on Helicobacter pylori. Materials and methods : Bibliometric analysis of original articles published until September 8, 2020, in journals indexed in PubMed, Scopus, Web of Science, LILACS, and SciELO. Bibliometric indicators were obtained. Likewise, analysis of the co-citation of authors and co-occurrence of terms with the terms included in the title and the abstract of publications was performed. Results : Data from 180 original articles were analyzed. An increase in the number of articles on H. pylori was found (R2 = 0.64, an average annual growth rate of 8.01%). A total of 777 authors were identified, with an average number of articles per author of 0.18, and a collaboration index of 5.64. The average number of citations per original article was 1.91. The Universidad Peruana Cayetano Heredia was the institution with the highest number of original articles (63.2%). The analysis of co-occurrence of terms found terms related to gastric cancer during the whole study period and, for recent years, terms related to the treatment of H. pylori infection and water sources. Conclusion : There is an increase in Peruvian production in original articles on H. pylori. In recent years, the study of the eradication of H. pylori and the transmission of the agent from water sources have been topics of interest.

RESUMEN Objetivo : Evaluar la producción científica peruana sobre Helicobacter pylori. Materiales y métodos : Análisis bibliométrico de artículos originales publicados hasta el 8 de setiembre de 2020 en revistas indexadas en PubMed, Scopus, Web of Science, LILACS y SciELO. Se obtuvieron indicadores bibliométricos. Asimismo, se realizó un análisis de la co-citación de autores y co- ocurrencia de términos con los términos incluidos en el título y el resumen de las publicaciones. Resultados : Se analizaron datos de 180 artículos originales. Se encontró un aumento en el número de artículos sobre H. pylori (R2 = 0,64, una tasa de crecimiento anual promedio de 8,01%). Se identificaron un total de 777 autores, con una media de artículos por autor de 0,18 y un índice de colaboración de 5,64. El número medio de citas por artículo original fue de 1,91. La Universidad Peruana Cayetano Heredia fue la institución con mayor número de artículos originales (63,2%). El análisis de co-ocurrencia de términos encontró términos relacionados con el cáncer gástrico durante todo el período de estudio y, en los últimos años, términos relacionados con el tratamiento de la infección por H. pylori y fuentes de agua. Conclusión : Existe un aumento en la producción peruana de artículos originales sobre H. pylori. En los últimos años, el estudio de la erradicación de H. pylori y la transmisión del agente desde fuentes de agua han sido temas de interés.