1. Department of Rheumatology, McGill University, Montreal, QC, Canada
2. Alan Edwards Pain Management Unit, McGill University, Montreal, QC, Canada
3. Department of Anesthesiology and Critical Care Medicine, Neurology and Physical Medicine and Rehabilitation at Johns Hopkins Hospital, Baltimore, MD, United States
4. Uniformed Services University of the Health Sciences, Bethesda, MD, United States
5. Department of Psychosomatic Medicine and Psychotherapy, Technische Universität München, München, Germany