1. Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington.
2. Department of Epidemiology, University of Washington, Seattle, Washington.
3. Department of Medicine, University of Washington, Seattle, Washington.
4. Fred Hutchinson Cancer Research Center, Seattle, Washington.
5. Seattle Children's Research Institute, Seattle, Washington.
6. Kenya Medical Research Institute, Nairobi, Kenya.
7. Department of Medicine, University of Rochester, Rochester, New York.
8. Department of Medicine, Northwestern University, Chicago, Illinois.
9. Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, California.