1. VA Puget Sound Health Care System , Seattle, Washington , USA
2. Division of Allergy and Infectious Diseases, University of Washington , Seattle, Washington , USA
3. VA Palo Alto Health Care System , Palo Alto, California , USA
4. VA North Texas Health Care System , Dallas, Texas , USA
5. Department of Medicine, University of Texas—Southwestern Medical Center , Dallas, Texas , USA
6. Corporal Michael J. Crescenz VA Medical Center , Philadelphia, Pennsylvania , USA
7. Perelman School of Medicine, University of Pennsylvania , Philadelphia, Pennsylvania , USA
8. VA Boston Health Care System , Boston, Massachusetts , USA
9. Department of Medicine, Harvard Medical School , Boston, Massachusetts , USA
10. Division of Pulmonary and Critical Care, University of Washington , Seattle, Washington , USA
11. Chobanian & Avedisian School of Medicine, Boston University , Boston, Massachusetts , USA
12. Department of Medicine—Infectious Diseases, Stanford University , Palo Alto, California , USA
13. VA Durham Health Care System , Durham, North Carolina , USA
14. Department of Medicine, Duke University Medical Center , Durham, North Carolina , USA
15. VA Salt Lake City Health Care System , Salt Lake City, Utah , USA
16. University of Utah School of Medicine , Salt Lake City, Utah , USA
17. Department of Epidemiology, University of Washington , Seattle, Washington , USA
18. Division of Endocrinology, Gerontology, and Metabolism, Department of Medicine , and, by courtesy, Department of Epidemiology and Population Health, Stanford University, Palo Alto, California , USA