0300-9041 0300-9041 S0300-90412017000900589 Mexico Mexico Mexico 00 00 2017 00 00 2017 85 9 589 594

1 The American College of Obstetricians and Gynecologists 2016 159 159 2 The American College of Obstetricians and Gynecologists 2016 160 160 3 2012 201-804-831 4 2012 119 924-35 5 1996 126 1 1 146-53 6 2011 21 2 2 78-85 7 World Health Organization 8 1996 49 12 12 1373-9 9 2005 24 1075-102