Barnhart, Kurt T.
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Univ Penn, Med Ctr, Dept Obstet & Gynecol, Sch Med, Philadelphia, PA 19104 USA
Univ Penn, Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA Univ Penn, Med Ctr, Dept Obstet & Gynecol, Sch Med, Philadelphia, PA 19104 USA