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Early Human Development > 2011 > 87 > 8 > 521-525
American Journal of Obstetrics and Gynecology > 1995 > 173 > 2 > 639-645
Early Human Development > 2011 > 87 > 8 > 521-525
American Journal of Obstetrics and Gynecology > 1995 > 173 > 2 > 639-645