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European Journal of Obstetrics and Gynecology > 2011 > 159 > 1 > 115-118
European Journal of Obstetrics and Gynecology > 2011 > 156 > 1 > 72-77
European Journal of Obstetrics and Gynecology > 2011 > 159 > 1 > 115-118
European Journal of Obstetrics and Gynecology > 2011 > 156 > 1 > 72-77