1. Plymouth UK
2. UK Cochrane Centre; Training Team; National Institute for Health Research Summertown Pavilion, Middle Way Oxford UK OX2 7LG
3. Oxford Oxfordshire UK
4. University of Oxford; Pain Research and Nuffield Department of Clinical Neurosciences (Nuffield Division of Anaesthetics); West Wing (Level 6) John Radcliffe Hospital Oxford Oxfordshire UK OX3 9DU