1. Department of Cardiology, University of Hull; Castle Hill Hospital; Cottingham Kingston-upon-Hull HU15 5JQ UK
2. Department of Cardiology; Hull Royal Infirmary; Anlaby Road Kingston-upon-Hull HU3 2JZ UK
3. Division of Cardiology, Mount Sinai Hospital; University Health Network; 600 University Avenue Toronto ON Canada M5J 1X5