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1by Josefina Medina-Lezama, Oscar L. Morey-Vargas, Humberto Zea-Díaz, Juan F. Bolaños-Salazar, Fernando Corrales-Medina, Carolina Cuba-Bustinza, Diana A. Chirinos-Medina, Julio A. ChirinosGet access
Published 2008
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3by Pedro Ordúñez, Luis Carlos Silva, María Paz Rodríguez, Sylvia RoblesGet access
Published in Revista Panamericana de Salud Pública (2001)
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