0028-3746 0028-3746 S0028-37462018000300198 Mexico 00 09 2018 00 09 2018 77 3 198 202

1 2008 12 4 4 458-64 2 World Health Organization 2007 3 2018 4 2006 84 4 4 297-304 5 2006 28 4 4 781-5 6 2006 61 11 11 930-4 7 2003 22 5 5 809-14 8 2003 25 3 3 249-53 9 1988 14 3 3 341-4 10 2004 26 1 1 8-12