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European Journal of Obstetrics and Gynecology > 2010 > 151 > 1 > 56-61
American Journal of Obstetrics and Gynecology > 2006 > 195 > 1 > 85-91
European Journal of Obstetrics and Gynecology > 2010 > 151 > 1 > 56-61
American Journal of Obstetrics and Gynecology > 2006 > 195 > 1 > 85-91