Affiliation: | (1) Department of cardiology, Western General Hospital, Crewe Road, EH4 2XU Edinburgh, UK;(2) Department of medical cardiology, University of Glasgow, 10 Alexandra Parade, G31 2ER Glasgow, UK;(3) Medical Statistics Unit, University of Edinburgh, Teviot Place, EH8 9AG Edinburgh, UK;(4) Department of statistics and health economics, University of Glasgow, University Avenue, G12 8QQ Glasgow, UK;(5) Department of Cardiac Surgery, Royal Infirmary of Edinburgh, Little France, UK |