1. University of Alabama at Birmingham, Birmingham
2. University of Michigan and Ann Arbor Veterans Administration Health Care System, Ann Arbor
3. University of Wisconsin, Madison
4. Duke University Medical Center, Durham, North Carolina
5. Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
6. Harbor-University of California at Los Angeles Medical Center, Torrance
7. Medical College of Georgia, Augusta
8. Nijmegen University Centre for Infectious Diseases, Nijmegen, The Netherlands
9. University of Texas at Houston, Houston
10. Cooper Hospital, Camden, New Jersey
11. Astra Zeneca Pharmaceuticals, Manchester, United Kingdom
12. National Cancer Institute, Bethesda, Maryland
13. Wayne State University, Detroit, Michigan