1. Division of Cardiology (S.A., C.J.R., M.A.C., J.S.R., J.P.V.), University of North Carolina, Chapel Hill
2. Division of Epidemiology, Gillings School of Public Health (S.A., P.D.S.), University of North Carolina, Chapel Hill
3. Division of Surgery (P.D.S., T.G.C.), University of North Carolina, Chapel Hill
4. Division of Cardiology, Warren Alpert Medical School of Brown University, Providence, RI (D.K.).
5. Department of Internal Medicine (K.F., G.J.), University of North Carolina, Chapel Hill