1. Oxford Oxfordshire UK
2. Thame UK
3. Helsinki University and Helsinki University Hospital; Department of Anaesthesia, Intensive Care and Pain Medicine; Helsinki Finland
4. Haukeland University Hospital; Regional Centre of Excellence in Palliative Care; Bergen Norway
5. Royal Hampshire County Hospital; Winchester UK SO22 5DG
6. University of Oxford; Pain Research and Nuffield Department of Clinical Neurosciences (Nuffield Division of Anaesthetics); Churchill Hospital Oxford UK OX3 7LJ
7. Plymouth UK