BJOG: An International Journal of Obstetrics & Gynaecology
BJOG: An International Journal of Obstetrics & Gynaecology > 124 > 6 > 937 - 944
BJOG: An International Journal of Obstetrics & Gynaecology > 124 > 6 > 880 - 889
BJOG: An International Journal of Obstetrics & Gynaecology > 124 > 6 > 863 - 871