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