1. Oxford Oxfordshire UK
2. Thame UK
3. Plymouth UK
4. Tufts Medical Center; Department of Anesthesiology and Perioperative Medicine; Boston MA USA
5. Haukeland University Hospital; Regional Centre of Excellence in Palliative Care; Bergen Norway
6. Tufts University School of Medicine; Pain Research, Education and Policy (PREP) Program, Department of Public Health and Community Medicine; Boston Massachusetts USA
7. West Hoe Surgery; 2 Cliff Road Plymouth Devon UK PL1 3BP
8. Churchill Hospital; Nuffield Department of Medicine and Sir Michael Sobell House; Old Road Headington Oxford UK OX3 7LJ