1. The Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
2. Institute of Health and Society, Newcastle University, Newcastle upon Tyne, UK
3. Newcastle Clinical Trials Unit, Newcastle University, Newcastle upon Tyne, UK
4. University Hospital Southampton NHS Foundation Trust, Southampton, UK
5. NHS Greater Glasgow and Clyde Health Board, Glasgow, UK
6. Royal Free London NHS Foundation Trust, London, UK