1. Lancashire Teaching Hospitals NHS Foundation Trust; Lancaster UK
2. University College London; Research Department of Clinical, Educational & Health Psychology; Gower Street London UK WC1E 6BT
3. University of Oxford; Pain Research and Nuffield Department of Clinical Neurosciences (Nuffield Division of Anaesthetics); Pain Research Unit, Churchill Hospital Oxford Oxfordshire UK OX3 7LE
4. Copenhagen University Hospital, Bispebjerg and Frederiksberg; The Parker Institute, Department of Rheumatology; Copenhagen Denmark