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BMC Pregnancy and Childbirth > 2016 > 16 > 1 > 1-8
Archives of Gynecology and Obstetrics > 2012 > 285 > 4 > 891-899
BMC Pregnancy and Childbirth > 2016 > 16 > 1 > 1-8
Archives of Gynecology and Obstetrics > 2012 > 285 > 4 > 891-899