1. From the Departments of Cardiovascular Medicine (S.S.G., S.A., E.M.T., S.G.E., T.Z., O.A., W.J.S., B.P.G., S.R.K.), Internal Medicine (N.B., L.J.), and Cardiothoracic Surgery (L.G.S.), Cleveland Clinic Foundation, Cleveland, OH, and University of Illinois College of Medicine, Rockford (N.S.P.).