American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2012 > 206 > 1 > 63.e1-63.e8
American Journal of Obstetrics and Gynecology > 2012 > 206 > 2 > 134.e1-134.e8
American Journal of Obstetrics and Gynecology > 2012 > 206 > 2 > 170.e1-170.e9