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Andrés-Gamboa O, Chicaíza L, García-Molina M, Díaz J, González M, Murillo R, Ballesteros M, Sánchez R.Andrés-Gamboa O, et al. Among authors: sanchez r.Salud Publica Mex. 2008 Jul-Aug;50(4):276-85. doi: 10.1590/s0036-36342008000400005.Salud Publica Mex. 2008.PMID: 18670718