1. Guy's and St Thomas’ NHS Foundation Trust, London SE1 7EH, UK
2. Department of General Surgery, Royal Gwent Hospital, Newport, South Wales NP20 2UB, UK
3. Queen's Medical Centre, Nottingham NG7 2UH, UK
4. St Mary's Hospital, London WZ INY, UK
5. Wexham Park Hospital, Wexham, Slough, Berkshire SL2 4HL, UK
6. Imperial College Business School, Imperial College London, London SW7 2AZ, UK