1134-8046 1134-8046 S1134-80462019000500011 10.20986/resed.2017.3624/2017 España 00 10 2019 00 10 2019 26 5 313 314 2014 134 44-50 2012 3 4 4 1000135 2017 11 3 3 211-6 2015 213 2 2 201.e1-201.e10 2016 128 4 4 713-23 2015 35 12 12 991-5 2016 215 4 4 506.e1-7 Committee on Obstetric Practice 2017 130 4 4 e205-9