0026-1742 0026-1742 S0026-17422015000100049 México Mexico México 00 02 2015 00 02 2015 58 1 49 55 2006 58 2 2 78-88 2008 13 1 1 5-11 2008 61 7 7 799-807 2010 23 1 1 59-65 2010 116 159-61 2007 60 1 1 27-41 2010 23 340 340 915 2009 47 1 1 29-32 World Health Organization