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BMC Pregnancy and Childbirth > 2018 > 18 > 1 > 1-8
BJOG: An International Journal of Obstetrics & Gynaecology > 123 > 1 > 111 - 118
American Journal of Obstetrics and Gynecology > 2007 > 197 > 2 > 156.e1-156.e6
BMC Pregnancy and Childbirth > 2018 > 18 > 1 > 1-8
BJOG: An International Journal of Obstetrics & Gynaecology > 123 > 1 > 111 - 118
American Journal of Obstetrics and Gynecology > 2007 > 197 > 2 > 156.e1-156.e6