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