1. Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Whitechapel, London E1 2AD, UK
2. School of Medicine, Cardiff University, Cardiff, UK
3. General Surgery Department, Northern Lincolnshire and Goole NHS Foundation Trust, Scunthorpe, UK
4. ENT Department, Kings College Hospital NHS Foundation Trust, London, UK
5. Department of Cardiology, Royal Free London NHS Foundation Trust, London, UK