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Ultrasound in Obstetrics & Gynecology > 57 > 3 > 417 - 422
European Journal of Obstetrics and Gynecology > 2003 > 110 > 2 > 159-163
Ultrasound in Obstetrics & Gynecology > 57 > 3 > 417 - 422
European Journal of Obstetrics and Gynecology > 2003 > 110 > 2 > 159-163