1. From William Beaumont Hospital, Royal Oak, Mich (C.L.G., A.W.); the Department of Medicine, University of Vermont, Burlington (M.W.W.); Minnesota Heart Clinic, Minneapolis (G.H.); the Department of Medicine, Johns Hopkins University, Baltimore, Md (J.B., J.R.); Mount Sinai Medical Center, New York, NY (J.M.); Berlex Laboratories, Montville, NJ (P.M.); and the Department of Medicine, UCSD and VA San Diego Healthcare System, San Diego, Calif (W.P., H.K.H., R.L.E.).