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Early Human Development > 2007 > 83 > 9 > 623-627
European Journal of Obstetrics and Gynecology > 2002 > 101 > 2 > 201-203
Early Human Development > 2007 > 83 > 9 > 623-627
European Journal of Obstetrics and Gynecology > 2002 > 101 > 2 > 201-203