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Best Practice & Research Clinical Obstetrics & Gynaecology > 2011 > 25 > 4 > 523-536
American Journal of Obstetrics and Gynecology > 1998 > 179 > 4 > 946-951
Best Practice & Research Clinical Obstetrics & Gynaecology > 2011 > 25 > 4 > 523-536
American Journal of Obstetrics and Gynecology > 1998 > 179 > 4 > 946-951