1. Department of Cardiology, Leeds Teaching Hospitals NHS Trust, Great George Street, Leeds General Infirmary, Leeds LS1 3EX, UK
2. Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, UK
3. Homeland Heart Center/Douala Cardiovascular Research Center, Douala, Cameroon
4. Univeristy of Aston, Birmingham, UK
5. Leeds and York Partnership NHS Foundation Trust and Leeds Institute of Health Sciences, Univeristy of Leeds, Leeds, UK