American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2005 > 193 > 4 > 1369-1375
American Journal of Obstetrics and Gynecology > 2005 > 193 > 4 > 1344-1352
American Journal of Obstetrics and Gynecology > 2005 > 193 > 4 > 1540-1543