1. Department of Psychosomatic Medicine and Psychotherapy; Technische Universität München; München Germany
2. Cochrane Pain, Palliative and Supportive Care Group; Pain Research Unit, Churchill Hospital; Oxford UK
3. Service de Médecine Interne et Thérapeutique; Hôtel Dieu, Université Paris Descartes, INSERM U 987; Paris France
4. Plymouth UK
5. Cyprus League Against Rheumatism; Nicosia Cyprus
6. School of Rehabilitation Science, College of Medicine; University of Saskatchewan; Saskatoon Canada