0300-9041 0300-9041 S0300-90412017000800489 Mexico USA 00 00 2017 00 00 2017 85 8 489 497

1 2007 12 3 3 147-52 2 2013 80 1 1 59-66 3 2001 75 6 6 1234-5 4 2006 54 6 6 623-39 5 2001 37 142-7 6 2006 91 10 10 3981-7 7 2002 66 7 7 1239-48 8 2009 2 CD003415 9 1995 45 400 400 589-93 10 1996 17 1 1 29-38 11 2004 1034 200-10 12 2007 3 CD005943 13 2008 2 CD003511 14 2013 10 CD003511 15 2013 208 42.e1-18 16 2011 24 5 5 659-67 17 2014 18 2015 250-85 19 National Institute for Health and Care Excellence 2015 1-25 20 2006 1 1 21 2003 188 419-24 22 2007 357 462-9 23 2015 122 1 1 80-91 24 American College of Obstetricians and Gynecologists 2008 25 2015 10 4 4 26 2016 27 2006 170 170 49-57 28 1992 15 801-6 29 1997 84 596-604 30 2015 101-15 31 2013 34 171-208 32 1994 62 485-90 33 2008 60 185-201 34 2011 8 Special Issue 1 Special Issue 1 157-76 35 2014 36 The Royal Australian and New Zealand College of Obstetricians and Gynecologist 2015 37 2012 19 3 3 257-71 38 The Society of Obstetricians and gynaecologist of Canada. (SOGC) 2013 39 1991 77 591-4 40 2005 13 1 1 39-46 41 2013 208 499.e1-5