1. Tobacco Research & Treatment Center, Massachusetts General Hospital, Boston
2. Division of General Internal Medicine, Department of Medicine, Massachusetts General Hospital, Boston
3. Health Policy Research Center, Mongan Institute, Massachusetts General Hospital, Boston
4. Harvard Medical School, Boston, Massachusetts
5. University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
6. University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
7. National Jewish Health, Denver, Colorado
8. Vanderbilt University Medical Center, Nashville, Tennessee
9. Geriatric Research Education and Clinical Centers, Veterans Affairs Tennessee Valley Healthcare System, Nashville