1. Biosciences
Division, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, United States
2. U.S.
Army Medical Research Institute of Infectious Diseases, Fort Detrick, 1425 Porter Street, Frederick, Maryland 21702, United States
3. University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, Texas 77555, United States