1. Veterans Affairs St. Louis Health Care System, St. Louis, Missouri
2. Washington University School of Medicine, St. Louis, Missouri
3. Infectious Disease Clinical Research Program, Department of Preventive Medicine and Biostatistics, Uniformed Services University of the Health Sciences
4. The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland
5. San Antonio Military Medical Center, JBSA Fort Sam Houston, Texas
6. Walter Reed National Military Medical Center, Bethesda, Maryland
7. Landstuhl Regional Medical Center, Germany