Dr. Campbell is with the Divisions of General Internal Medicine, Geriatrics and Nephrology, and the Departments of Medicine and of Pharmacology and Therapeutics, University of Calgary, Calgary, Alta.; Dr. Burgess is with the Division of Nephrology, Department of Medicine, University of Calgary, Calgary, Alta.; Dr. Taylor is with the Bureau of Cardio-Respiratory Diseases and Diabetes, Laboratory Centre for Disease Control, Health Canada, Ottawa, Ont.; Dr. Wilson is with the Heart and Stroke Foundation of Canada, Ottawa, Ont.; Dr. Cleroux is with the Hypertension Research Unit, Centre de recherche du Centre hospitalier de l'Universite de Laval, and the Department of Medicine, Universite Laval, Sainte-Foy, Que.; Dr. Fodor is with the University of Ottawa Heart Institute, Ottawa, Ont.; Dr. Leiter is with the Departments of Medicine and Nutritional Sciences, University of Toronto, Toronto, Ont.; and Dr. Spence is with the Departments of Neurosciences, of Internal Medicine and of Pharmacology and Toxicology, University of Western Ontario, London, Ont.