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International Journal of Gynecology and Obstetrics > 2013 > 120 > 2 > 169-172
European Journal of Obstetrics and Gynecology > 2006 > 124 > 1 > 53-57
International Journal of Gynecology and Obstetrics > 2013 > 120 > 2 > 169-172
European Journal of Obstetrics and Gynecology > 2006 > 124 > 1 > 53-57