1. Bacterial Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, 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. San Antonio Military Medical Center, Joint Base San Antonio, Fort Sam Houston, Texas.