1. Division of Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, MD
2. Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD
3. Department of General Internal Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
4. Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD
5. University of Washington School of Medicine, Division of General Internal Medicine, Seattle, WA
6. Department of Internal Medicine, University of Colorado School of Medicine, Aurora, CO, USA.