1. Department of Internal Medicine; University of Michigan; Ann Arbor MI
2. National Institute of Allergy and Infectious Diseases; Bethesda MD
3. Department of Internal Medicine; Loyola Medical Center; Maywood IL
4. Einstein Medical Center; Philadelphia PA
5. Department of Internal Medicine; University of Pittsburgh; Pittsburgh PA
6. Department of Public Health Sciences; Medical University of South Carolina; Charleston SC
7. University of Texas Southwestern; Dallas TX