1. Edinburgh Cancer Research Centre, The University of Edinburgh, Edinburgh, UK
2. St Columba’s Hospice, Edinburgh, UK
3. Faculty of Medicine, Witten/Herdecke University, Witten, Germany
4. Clinic for Pain and Palliative Care Medicine, St.-Marien-Hospital Lünen, Lünen, Germany
5. Otsuka Pharmaceutical Development & Commercialization, Inc., Princeton, NJ, USA
6. GW Pharmaceuticals Ltd, Cambridge, UK
7. Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA, USA