1. Papworth Hospital; Cardiac Unit; Papworth Everard Cambridge UK CB3 8RE
2. 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
3. Haukeland University Hospital; Regional Centre of Excellence in Palliative Care; Bergen Norway
4. Royal Hampshire County Hospital; Winchester UK SO22 5DG