机构:
Columbia Univ, Dept Obstet & Gynecol, Coll Phys & Surg, Med Ctr, New York, NY 10032 USA
Joseph L Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY USAColumbia Univ, Dept Obstet & Gynecol, Coll Phys & Surg, Med Ctr, New York, NY 10032 USA
Ananth, Cande V.
Williams, Michelle A.
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机构:
Harvard Univ, Sch Publ Hlth, Dept Epidemiol, Boston, MA 02115 USAColumbia Univ, Dept Obstet & Gynecol, Coll Phys & Surg, Med Ctr, New York, NY 10032 USA