1. Departments of Physiology, Microbiology, and Medicine (M.J.S., S.N.F., E.S.G., D.L.S.G., V.A.G.), Dartmouth Medical School, Lebanon, New Hampshire 03756
2. Nuclear Medicine and Medical Services (B.T., S.W.), Department of Veterans’ Affairs Medical Center, Long Beach, California 90822
3. Harbor-UCLA Medical Center (A.F.P.), Torrance, California 90509