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European Journal of Obstetrics and Gynecology > 2011 > 154 > 2 > 146-150
Placenta > 2005 > 26 > Supplement > S81-S86
European Journal of Obstetrics and Gynecology > 2011 > 154 > 2 > 146-150
Placenta > 2005 > 26 > Supplement > S81-S86