From the Division of Cardiology, Department of Medicine (K.C.W., L.A.B., S.P.S., R.S.B., J.A.C.L.) and the Division of Diagnostic Imaging, Department of Radiology (E.A.Z., C.H.L.), The Johns Hopkins University School of Medicine, Baltimore, Md, and The Feinberg Cardiovascular Research Institute (R.M.J.), Northwestern University Medical School, Chicago, Ill. (At 1998-03-03)
