1. University of California, San Francisco
2. Group Health Research Institute, Seattle, Washington
3. University of Iowa, Iowa City
4. Columbia University, Manhattan, New York
5. State University of New York Upstate Medical University, Syracuse
6. Pima County Department of Health, Tucson, Arizona
7. Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts
8. University of Louisville, Louisville, Kentucky
9. Duke University, Durham, North Carolina
10. Fairfax Family Practice, Fairfax, Virginia11Virginia Commonwealth University, Richmond
11. Yale University, New Haven, Connecticut
12. University of Alabama at Birmingham
13. University of California, Los Angeles
14. University of Washington, Seattle
15. Brown University, Providence, Rhode Island
16. University of North Carolina, Chapel Hill