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European Journal of Obstetrics and Gynecology > 2009 > 144 > 2 > 135-139
Transactions of the Royal Society of Tropical Medicine and Hygiene > 2000 > 94 > 4 > 413-418
European Journal of Obstetrics and Gynecology > 2009 > 144 > 2 > 135-139
Transactions of the Royal Society of Tropical Medicine and Hygiene > 2000 > 94 > 4 > 413-418