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Journal of Obstetrics and Gynaecology Research > 47 > 9 > 3171 - 3178
BJOG: An International Journal of Obstetrics & Gynaecology > 124 > 5 > 796 - 803
American Journal of Obstetrics and Gynecology > 2010 > 202 > 6 > 624.e1-624.e9