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Univ Penn, Sch Med, Maternal & Child Hlth Res Program, Philadelphia, PA 19104 USA
Univ Penn, Sch Med, Prematur Prevent Program, Philadelphia, PA 19104 USA
Univ Penn, Sch Med, Dept Obstet & Gynecol, Obstet & Gynecol, Philadelphia, PA 19104 USA Univ Pittsburgh, Grad Sch Publ Hlth, Dept Epidemiol, Pittsburgh, PA 15261 USA