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BJOG: An International Journal of Obstetrics & Gynaecology > 123 > 6 > 965 - 973
BJOG: An International Journal of Obstetrics & Gynaecology > 123 > 4 > 588 - 597
BJOG: An International Journal of Obstetrics & Gynaecology > 118 > 12 > 1455 - 1463