1137-6627 1137-6627 S1137-66272017000300351 10.23938/assn.0043 Spain Spain Spain Ecuador 00 12 2017 00 12 2017 40 3 351 360

Sociedad Española de Ginecología y Obstetricia 2010 90-2 3 1964 24 266-8 4 1966 28 479-83 5 2006 49 573-84 6 2012 286 739-53 7 2013 30 625-30 8 2011 117 805-11 9 2012 41 339-45 10 2012 120 53-9 11 2010 23 1406-12 12 2005 17 315-22 13 2004 15 319-23 14 2000 2 15 2007 27 4-8 16 2005 84 456-62 17 2013 41 76-83 18 1987 27 309-11 19 2009 114 386-97 20 2013 35 840-57