0120-0011 0120-0011 S0120-00112016000400671 10.15446/revfacmed.v64n4.54489 Colombia Colombia 00 12 2016 00 12 2016 64 4 671 677

2007 2006 58 2 2 139-52 2007 38 4 4 352-6 American College of Obstetricians and Gynecologists 2011 117 4 4 1028-31 2006 37 3 3 176-82 1994 84 6 6 903-12 1998 18 2 2 202-12 1995 2 1 1 22-7 1995 311 7018 7018 1460-3 1997 34 741-5 1998 52 777 777 459-67 1998 63 4 4 1160-74 2003 189 3 3 769-74 2005 7 7 7 484-94 2005 9 2 2 158-66 2007 10 2 2 103-9 2010 50 1 1 51-9 2012 11 4 4 281-7 2008 85 2 2 133-47 2000 91 4 4 277-9 2010 5 44-50