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BMC Pregnancy and Childbirth > 2019 > 19 > 1 > 1-9
Archives of Gynecology and Obstetrics > 2009 > 280 > 1 > 91-97
BMC Pregnancy and Childbirth > 2019 > 19 > 1 > 1-9
Archives of Gynecology and Obstetrics > 2009 > 280 > 1 > 91-97