1. Green Templeton College, University of Oxford, Oxford, OX2 6HG, UK
2. Elderly Care, Royal Berkshire Hospital NHS Foundation Trust, Reading, RG1 5AN, UK
3. General Surgery, Sandwell General Hospital, Sandwell & West Birmingham NHS Trust, West Bromwich, B71 4HJ, UK
4. General Surgery, Queens Hospital Burton, University Hospitals of Derby and Burton NHS Trust, Burton-on-Trent, DE13 0RB, UK
5. Renal Unit, New Cross Hospital, The Royal Wolverhampton NHS Trust, Wolverhampton, WV10 0QP, UK
6. General Surgery, New Cross Hospital, The Royal Wolverhampton NHS Trust, Wolverhampton, WV10 0QP, UK
7. General Surgery, Birmingham Heartlands Hospital, University Hospitals Birmingham NHS Foundation Trust, Birmingham, B9 5SS, UK
8. Intensive Care, Maidstone & Tunbridge Wells NHS Trust, Tunbridge Wells Hospital, Tunbridge Wells, TN2 4QJ, UK
9. General Surgery, Weston General Hospital, University Hospitals Bristol and Weston NHS Foundation Trust, Weston-super-Mare, BS23 4TQ, UK
10. Division of Hematology-Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
11. Center for Hematology-Oncology, Barts Cancer Institute, Queen Mary University of London, London, EC1M 6AU, UK
12. Nuffield Department of Population Health, Oxford University Hospitals NHS Foundation Trust, John Radcliffe Hospital, Oxford, OX3 9DU, UK