2014-01-02
作者：the American College of Obstetricians and Gynecologists，409,12th street，SW,PO box 92960，Washington DC 20090-6920 译者：周菁 审校：张师前
来源：ACOG Practice Bulletin No.63. American College of Obstetricians and Gynecologists. Obstet Gynecol 2005；105：1533-45.
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