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American Journal of Obstetrics and Gynecology > 1996 > 174 > 5 > 1494-1498
European Journal of Obstetrics & Gynecology and Reproductive Biology > 1995 > 62 > 2 > 159-166
American Journal of Obstetrics and Gynecology > 1996 > 174 > 5 > 1494-1498
European Journal of Obstetrics & Gynecology and Reproductive Biology > 1995 > 62 > 2 > 159-166