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American Journal of Obstetrics and Gynecology > 2015 > 212 > 5 > 630.e1-630.e7
BJOG: An International Journal of Obstetrics & Gynaecology > 121 > 10 > 1284 - 1290
BJOG: An International Journal of Obstetrics & Gynaecology > 121 > s1 > 89 - 100
Ultrasound in Obstetrics & Gynecology > 39 > 5 > 500 - 504