American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1996 > 174 > 2 > 612-616
American Journal of Obstetrics and Gynecology > 2009 > 200 > 5 > 508.e1-508.e6
American Journal of Obstetrics and Gynecology > 1996 > 174 > 2 > 612-616
American Journal of Obstetrics and Gynecology > 2009 > 200 > 5 > 508.e1-508.e6