1. From University of California (R.T.H.), San Francisco; Columbia University (P.M.M.), New York, NY; Royal Perth Hospital, (C.C.P.), Australia; Miami Cardiac and Vascular Institute (J.J.C.), Fla; Mid-South Imaging and Therapeutics (J.D.B.), Memphis, Tenn; The Reading Hospital and Medical Center (D.S.), West Reading, Pa.