1. Department of Medicine, Georgetown University, Washington, D.C.
2. Department of Biostatistics, Bioinformatics, and Biomathematics, Georgetown University, Washington, D.C.
3. Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland.
4. John H. Stroger Hospital of Cook County, Chicago, Illinois.
5. Epidemiology Branch, Basic Sciences Program, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland.
6. Department of Preventive Medicine and Community Health, State University of New York Downstate Medical Center, Brooklyn, New York.
7. City of Hope National Medical Center, Duarte, California.
8. Montefiore Medical Center, Bronx, New York.
9. Department of Medicine, University of California, San Francisco, San Francisco, California.
10. Department of Family Medicine, Georgetown University Medical Center, Washington, D.C.