1. Division of Rheumatology, McGill University Health Centre, Montreal, and Alan Edwards Pain Management Unit, McGill University Health Centre, Montreal, Canada. mary-ann.fitzcharles@muhc.mcgill.ca
2. JSS Medical Research, St-Laurent, Canada.
3. JSS Medical Research, St-Laurent, and Jewish General Hospital, McGill University, Montreal, Quebec, Canada.
4. Alan Edwards Pain Management Unit, McGill University Health Centre, Montreal, Canada.
5. Division of Rheumatology, McGill University Health Centre, Montreal, Canada.
6. Department Internal Medicine I, Klinikum Saarbrücken, and Department of Psychosomatic Medicine and Psychotherapy, Technische Universität München, Germany.