1. Department of Biology and Emerging Pathogens Institute, University of Florida, Gainesville, Florida, USA
2. Respiratory Health Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA
3. Section of Infectious Diseases, and Research and Development Service, Veterans Affairs St. Louis Health Care System, St. Louis, MO, USA
4. Division of Infectious Diseases, Allergy, and Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA
5. Infectious Disease Division, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
6. Veterans Affairs Eastern Colorado Healthcare System, Denver, CO, USA
7. Division of Infectious Diseases, Department of Medicine, University of Colorado - Denver, Aurora, CO, USA
8. Department of Biostatistics and Epidemiology, University of Massachusetts, Amherst, MA, USA
9. Veterans Affairs Medical Center, Washington, DC, USA
10. Department of Medicine, George Washington University School of Medical and Health Sciences, Washington, DC, USA
11. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
12. Department of Infectious Disease, Children’s Hospital Colorado, Aurora, CO, USA
13. Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA
14. Infectious Disease Section, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA
15. Denver Health Medical Center, Denver, CO, USA
16. Veterans Affairs New York Harbor Healthcare System, New York, NY, USA
17. Division of Infectious Diseases and Immunology, Department of Medicine, NYU School of Medicine, New York, NY, USA
18. Division of Infectious Diseases and Geographic Medicine, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA