1. Department of Epidemiology, Graduate School of Public Health (J.J.A., Y.Z.), Pennsylvania 15261
2. Department of Obstetrics, Gynecology and Reproductive Sciences (J.J.A.), University of Pittsburgh. Pittsburgh, Pennsylvania 15261
3. Department Obstetrics and Gynecology (A.I.N.), McGill University, Montréal, H3A 0G4, Canada
4. Department of Obstetrics and Gynecology (E.B.), School of Medicine and Dentistry, University of Rochester, Rochester, New York 14604
5. Division of Epidemiology & Community Health (R.H.N.), University of Minnesota, Minneapolis, Minnesota 55455
6. Department of Pediatrics (S.S.), Seattle Children's Research Institute, University of Washington, Seattle, Washington 98105
7. Department of Obstetrics, Gynecology and Reproductive Sciences (M.-P.T.), University of California, San Francisco, Francisco, California 94143
8. Department of Medicine (J.B.R.), University of Minnesota, Minneapolis, Minnesota 55455
9. Department of Preventive Medicine (S.H.S.), Icahn School of Medicine at Mt Sinai, New York, New York 10029