0300-9041 0300-9041 S0300-90412017000600347 Mexico 00 00 2017 00 00 2017 85 6 347 354

1 World Health Organization. WHO 2011 2 3 4 2008 5 2015 83 505-14 6 2011 204 508-10 7 2011 25 391-4 8 2011 2011 1-7 9 2010 5 173-92 10 2011 24 489-95 11 2011 58 548-9 12 2011 139 505-15 13 2012 119 484-92 14 2008 29 S67-72 15 2011 24 489-95 16 2010 22 511-3 17 2008 35 160-5 18 2013 170 1-8