1. Department of Rheumatology, Tel Aviv Sourasky Medical Center, 64239 Tel Aviv, Israel
2. Division of Rheumatology, Alan Edwards Pain Management Unit, McGill University Health Centre, Canada
3. Department of Medicine, H. Soroka Medical Center, 84101 Beer Sheva, Israel
4. Edwards Pain management Unit, McGill University Health Centre, Canada H3G 1A4
5. Department of Neurology, Universitätsklinikum Würzburg, 81865 Würzburg, Germany
6. Department Internal Medicine I, Klinikum Saarbrücken, 66119 Saarbrücken, Germany
7. Department of Psychosomatic Medicine and Psychotherapy, Technische Universität München, München, 90780 Würzburg, Germany