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BJOG: An International Journal of Obstetrics & Gynaecology > 119 > 1 > 40 - 50
European Journal of Epidemiology > 1999 > 15 > 4 > 349-354
BJOG: An International Journal of Obstetrics & Gynaecology > 119 > 1 > 40 - 50
European Journal of Epidemiology > 1999 > 15 > 4 > 349-354