American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1999 > 180 > 4 > 1045-1046
American Journal of Obstetrics and Gynecology > 1999 > 180 > 5 > 1209-1214
American Journal of Obstetrics and Gynecology > 1999 > 181 > 1 > 159-164
American Journal of Obstetrics and Gynecology > 1999 > 181 > 4 > 921-923
American Journal of Obstetrics and Gynecology > 1999 > 181 > 6 > 1560-1569
American Journal of Obstetrics and Gynecology > 1999 > 181 > 6 > 1407-1413