1. University of Ulster; All Ireland Institute of Hospice and Palliative Care, School of Health Sciences; Belfast Northern Ireland UK
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. University of Ulster; Faculty of Life and Health Sciences; Shore Road Newtownabbey Co. Antrim Northern Ireland UK BT37 0QB