1. Division of Experimental Therapeutics, Walter Reed Army Institute of Research, 503 Robert Grant Ave., Silver Spring, Maryland 20910
2. Department of Veterinary Medicine, United States Army Medical Component, Armed Forces Research Institute of Medical Sciences, 315/6, Rajthevi, Bangkok, Thailand 10400
3. Tropical Medicine Research/Gorgas Memorial Research Institute, Ave. Justo Arosemena no. 3530, Panama City, Panama
4. Division of Neuroscience, Walter Reed Army Institute of Research, 503 Robert Grant Ave., Silver Spring, Maryland 20910