1. Infectious Diseases Section, Veterans Affairs Medical Center, Boise, Idaho
2. University of Washington School of Medicine, Seattle, Washington
3. University of Miami Miller School of Medicine, Miami, Florida
4. Infectious Diseases, San Francisco General Hospital, San Francisco
5. University of California—San Francisco, San Francisco
6. University of Missouri Health Science Center, University of Missouri, Columbia
7. Department of Surgery, Seattle, Washington
8. R. M. Alden Research Laboratory, Santa Monica
9. University of California, Los Angeles School of Medicine, Los Angeles
10. Tufts University School of Medicine, Boston, Massachusetts
11. Seattle Veterans Affairs Medical Center, Seattle, Washington
12. University of Minnesota Medical School, Minneapolis, Minnesota
13. Division of Epidemiology, University of Minnesota School of Public Health, Minneapolis, Minnesota
14. Department of Medicine, Palo Alto, California
15. Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Palo Alto, California
16. Research Institute, Palo Alto Medical Foundation, Palo Alto, California
17. Division of Neoplastic Diseases and Related Disorders, Medical College of Wisconsin, Milwaukee, Wisconsin