1. Walter Reed National Military Medical Center, Bethesda, Maryland.
2. Infectious Disease Clinical Research Program, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
3. Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
4. Landstuhl Regional Medical Center, Landstuhl, Germany.
5. San Antonio Military Medical Center, Fort Sam Houston, Texas.