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BMC Pregnancy and Childbirth > 2018 > 18 > 1 > 1-6
Archives of Gynecology and Obstetrics > 2011 > 283 > 4 > 893-898
BMC Pregnancy and Childbirth > 2018 > 18 > 1 > 1-6
Archives of Gynecology and Obstetrics > 2011 > 283 > 4 > 893-898