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BMC Pregnancy and Childbirth > 2019 > 19 > 1 > 1-8
Best Practice & Research Clinical Obstetrics & Gynaecology > 2008 > 22 > 3 > 559-567
BMC Pregnancy and Childbirth > 2019 > 19 > 1 > 1-8
Best Practice & Research Clinical Obstetrics & Gynaecology > 2008 > 22 > 3 > 559-567