1. Department of Psychosomatic Medicine and Psychotherapy; Technische Universität München; München Germany
2. Health Care Center for Pain Medicine and Mental Health; Saarbrücken Germany
3. Department of Palliative Medicine; University Hospital of Bonn; Bonn Germany
4. Cochrane Pain, Palliative and Supportive Care Group; Pain Research Unit, Churchill Hospital; Oxford UK
5. Centre for Pain Research; University of Bath; Bath UK
6. Emerita, Regional Centre of Excellence in Palliative Care; Haukeland University Hospital; Bergen Norway
7. Plymouth UK