Affiliation: | From the Division of General Internal Medicine and Mazankowski Alberta Heart Institute (McAlister), University of Alberta, Edmonton, Alta.; the Departments of Medicine, of Community Health Sciences and of Physiology and Pharmacology (Herman, Campbell), Libin Cardiovascular Institute, University of Calgary, Calgary Alta.; and the Divisions of General Internal Medicine (Khan) and of Cardiology (Rabkin), University of British Columbia, Vancouver, BC |