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au:rivas, ronald
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Saber dec 2014, Volume 26 N. 4 Pages 458 - 464

Revista Panamericana de Salud Pública jun 2014, Volume 35 N. 5-6 Pages 353 - 358

Innovar jan 2011, Volume 21 N. 39 Pages 205 - 216

Gen mar 2008, Volume 62 N. 1 Pages 14 - 16

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