BJOG: An International Journal of Obstetrics and Gynaecology 119 (2012) 7 BJOG: An International Journal of Obstetrics and Gynaecology, 119(7), 840-847 BJOG : an International Journal of Obstetrics and Gynaecology, 119, 840-7 BJOG : an International Journal of Obstetrics and Gynaecology, 119, 7, pp. 840-7 BJOG, 119(7), 840-847. Wiley-Blackwell Bjog-An International Journal of Obstetrics and Gynaecology, 119(7), 840-847. Wiley-Blackwell Publishing Ltd