American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2013 > 208 > 2 > 115.e1-115.e9
American Journal of Obstetrics and Gynecology > 2013 > 208 > 6 > 451.e1-451.e11
American Journal of Obstetrics and Gynecology > 2013 > 209 > 1 > 51.e1-51.e6
American Journal of Obstetrics and Gynecology > 2013 > 209 > 2 > 145.e1-145.e6