1. Primary Care Unit Department of Public Health and Primary Care University of Cambridge CambridgeUK
2. School of Clinical Medicine University of Cambridge CambridgeUK
3. Department of Oncology Addenbrooke’s Hospital University of Cambridge CambridgeUK
4. MRC Epidemiology Unit University of Cambridge CambridgeUK
5. School of Medicine University of Nottingham NottinghamUK
6. Nuffield Department of Primary Care Health Sciences University of Oxford OxfordUK
7. Royal Bournemouth Hospital BournemouthUK
8. Department of Surgery Addenbrooke’s Hospital University of Cambridge Cambridge UK