1. Los Angeles Biomedical Research Institute, Torrance, California.
2. Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland.
3. Department of Infectious Diseases and Microbiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania.
4. Feinberg School of Medicine, Division of Infectious Diseases, Northwestern University, Chicago, Illinois.
5. Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, Maryland.