[1] Indiana Univ, Sch Med, Dept Obstet & Gynecol, Bloomington, IN 47405 USA
[2] Indiana Univ, Sch Med, Dept Pediat, Bloomington, IN 47405 USA
[3] Indiana Univ Purdue Univ, Indiana Univ Survey Res Ctr, Indianapolis, IN 46202 USA
[4] Indiana Univ Ctr Pharmacogenet & Therapeut Res Ma, PREGMED, Indianapolis, IN USA