[1] Henry Ford Hlth Syst, Dept Gynecol Obstet & Womens Hlth, Detroit, MI 48202 USA
[2] Michigan State Univ, Coll Human Med, Dept Epidemiol & Biostat, Lansing, MI USA
[3] Wayne State Univ, Sch Med, Dept Obstet & Gynecol, Detroit, MI 48201 USA
[4] Univ Michigan, Dept Psychol, Ann Arbor, MI USA
[5] Michigan State Univ, Dept Pediat & Human Dev, Coll Human Med, Lansing, MI USA