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 > 1353-1360
American Journal of Obstetrics and Gynecology > 2005 > 193 > 4 > 1517-1521