0300-9041 0300-9041 S0300-90412019000300006 10.24245/gom.v87i3.2541 Mexico Mexico 00 00 2019 00 00 2019 87 3 190 195

1 2007 8 1 1 24-9 2 2011 378 9809 9809 2095-103 3 2012 207 2 2 125-7 4 American College of Obstetricians and Gynecologists ACOG 2009 114 386-97 5 American College of Obstetricians and Gynecologists ACOG 2010 116 2-1 2-1 40-63 6 2013 13 25 25 7 2014 290 4 4 669-76 8 2014 57 2 2 369-76 9 2016 293 1 1 75-80 10 2010 203 5 5 418-29 11 2011 159 2 2 315-9