[1] Univ Michigan, Sch Publ Hlth, Dept Environm Hlth Sci, Ann Arbor, MI 48109 USA
[2] Ctr Dis Control & Prevent, Atlanta, GA USA
[3] Harvard Univ, Sch Publ Hlth, Dept Environm Hlth, Boston, MA 02115 USA
[4] Massachusetts Gen Hosp, Vincent Mem Obstet & Gynecol Serv, Androl Lab, Boston, MA 02114 USA
[5] Massachusetts Gen Hosp, Vitro Fertilizat Unit, Boston, MA 02114 USA