1. Alan Edwards Pain Management Unit; McGill University Health Centre; Montreal Quebec Canada
2. Division of Rheumatology; McGill University Health Centre; Montreal Quebec Canada
3. Pain Center; Cochin Hospital; Paris Descartes University; France
4. Department Internal Medicine I; Klinikum Saarbrücken; Germany
5. Department of Psychosomatic Medicine and Psychotherapy; Technische Universität München; Germany