[1] Univ Calif San Francisco, Ctr Reprod Hlth, Dept Obstet Gynecol & Reprod Sci, San Francisco, CA 94115 USA
[2] Michigan State Univ, Dept Obstet Gynecol & Reprod Biol, E Lansing, MI 48824 USA
[3] Michigan State Univ, Dept Epidemiol, E Lansing, MI 48824 USA
[4] Univ Michigan, Sch Publ Hlth, Dept Biostat, Ann Arbor, MI 48109 USA
[5] Univ Illinois, Dept Obstet & Gynecol, Div Reprod Endocrinol & Infertil, Chicago, IL 60612 USA
[6] Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Program Reprod & Adult Endocrinol, NIH, Bethesda, MD USA
[7] Univ Kansas, Sch Med, Dept Obstet & Gynecol, Wichita, KS 67214 USA
[8] Univ Kansas, Sch Med, Ctr Reprod Med, Wichita, KS 67214 USA
[9] Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Obstet Gynecol & Reprod Biol, Boston, MA 02115 USA