1. Division of Cardiology, Department of Medicine (D.D.H., P.R., H.Q., M.N., X.W., N.G., L.M., M.L.S.), University of California, San Francisco.
2. Now with School of Medicine and Dentistry, University of Rochester, NY (D.D.H.).
3. Center for Tobacco Control Research and Education (P.R., M.L.S.), University of California, San Francisco.
4. Now with CHRISTUS Good Shepherd/Texas A&M University Internal Medicine Residency Program, Longview (P.R.).
5. Now with Department of Cardiovascular Diseases, Physiology and Biomedical Engineering, Mayo Clinic Arizona, Scottsdale (H.Q.).
6. Division of Occupational and Environmental Medicine, Department of Medicine (A.H., B.G.P., S.F.S.), University of California, San Francisco.
7. Cardiovascular Research Institute (M.L.S.), University of California, San Francisco.