American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1996 > 175 > 2 > 484-488
American Journal of Obstetrics and Gynecology > 1999 > 180 > 4 > 1045-1046
American Journal of Obstetrics and Gynecology > 2001 > 184 > 4 > 686-693
American Journal of Obstetrics and Gynecology > 2014 > 211 > 2 > 158.e1-158.e6
American Journal of Obstetrics and Gynecology > 2016 > 215 > 5 > 636.e1-636.e72