1. Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
2. Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts
3. Public Health Division, Fred Hutchinson Cancer Research Center, Seattle, Washington
4. MedStar Research Institute, Washington, D.C.
5. Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania
6. Department of Obstetrics and Gynecology, University of California, Los Angeles, Los Angeles, California
7. Children's Hospital, Boston, Massachusetts
8. Department of Epidemiology, University of California, Los Angeles, School of Public Health, Los Angeles, California
9. Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California