1. Chemical and Biological Defence Section, Defence Research Establishment Suffield, P.O. Box 4000, Station Main, Medicine Hat, Alberta, Canada, T1A 8K6
2. Geo-Centers Inc., Suite 405, 1801 Rockville Pike, Rockville, MD.
3. Diagnostic Systems Division, U.S. Army Medical Research Institute of Infectious Diseases, Ft. Detrick, Frederick, MD.