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