1. Department of Cardiology, Postgraduate Medical Institute, Division of Cardiovascular and Respiratory Studies; University of Hull, Castle Hill Hospital; Cottingham Kingston-upon-Hull HU16 5JQ UK
2. Department of Cardiology; Castle Hill Hospital; Cottingham Kingston-upon-Hull HU16 5JQ UK
3. Department of Primary Care and General Practice; University of Birmingham; Edgbaston Birmingham B15 2TT UK