1. NHS Gloucestershire CCG; Sanger House, 5220 Valiant Court Gloucester Business Park Brockworth UK GL3 4FE
2. University of Oxford; Pain Research and Nuffield Department of Clinical Neurosciences (Nuffield Division of Anaesthetics); Oxford Oxfordshire UK
3. Royal Hampshire County Hospital; Winchester UK SO22 5DG
4. Churchill Hospital, Oxford University Hospitals NHS Trust; Oxford Pain Relief Unit; Old Road Headington Oxford UK OX3 7LE
5. Pain Research Unit, Churchill Hospital; Cochrane Pain, Palliative and Supportive Care Group; Churchill Hospital Oxford Oxfordshire UK OX3 7LE
6. University of Nottingham; School of Pharmacy; University Park Nottingham UK NG7 2RD