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American Journal of Obstetrics and Gynecology > 1997 > 176 > 3 > 560-566
American Journal of Obstetrics and Gynecology > 1996 > 174 > 5 > 1631-1636
American Journal of Obstetrics and Gynecology > 1997 > 176 > 3 > 560-566
American Journal of Obstetrics and Gynecology > 1996 > 174 > 5 > 1631-1636