1. Department of Cardiology; Leeds General Infirmary; Leeds United Kingdom
2. Department of Cardiology; Royal Infirmary of Edinburgh; Edinburgh United Kingdom
3. Department of Cardiology; University Hospital of North Staffordshire; Stoke-on-Trent United Kingdom
4. Department of Cardiology; Forth Valley Royal; Edinburgh United Kingdom
5. Division of Cardiovascular and Diabetes Research; Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds; Leeds United Kingdom