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BJOG: An International Journal of Obstetrics & Gynaecology > 118 > 8 > 985 - 990
American Journal of Obstetrics and Gynecology > 1997 > 177 > 5 > 1038-1040
BJOG: An International Journal of Obstetrics & Gynaecology > 118 > 8 > 985 - 990
American Journal of Obstetrics and Gynecology > 1997 > 177 > 5 > 1038-1040