1. Division of Cardiology (T.D., C.K., R.A., S.H.-Z., M.A., V.S., S.S.), University of Maryland, Baltimore.
2. Department of Medicine, Michigan State University College of Human Medicine, East Lansing (C.C.H.).
3. Department of Medicine (J.S.), University of Maryland, Baltimore.
4. Division of Cardiac Surgery (B.G., M.M.), University of Maryland, Baltimore.