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American Journal of Obstetrics and Gynecology > 1996 > 175 > 4 Part 1 > 830-833
American Journal of Obstetrics and Gynecology > 1995 > 173 > 4 > 1223-1227
American Journal of Obstetrics and Gynecology > 1996 > 175 > 4 Part 1 > 830-833
American Journal of Obstetrics and Gynecology > 1995 > 173 > 4 > 1223-1227