1. From the Division of Cardiovascular Disease (P.R.K.), Lankenau Hospital and Institute of Medical Research, Wynnewood, Pa; the Division of Cardiology (P.D.), St Michael’s Hospital and University of Toronto, Toronto, Ontario, Canada; Libin Cardiovascular Institute of Alberta (L.B.M.), Calgary Health Region and University of Calgary, Calgary, Alberta, Canada; Baylor College of Medicine and The Methodist Hospital (C.M.P.), Houston, Tex; the Department of Medicine (D.R.), Montreal Heart Institute and...