1. Department of Medicine, McGill University, Montreal, Canada.
2. Department of Mathematics & Statistics, Concordia University, Montreal, Canada.
3. Department of Rheumatology, McGill University, Montreal, Canada.
4. Alan Edwards Pain Management Unit, McGill University, Montreal, Canada.
5. Department of Family Medicine, McGill University, Montreal, Canada.
6. Division of Clinical Epidemiology, McGill University, Montreal, Canada.
7. McGill Comprehensive Health Improvement Program, Faculty of Medicine, McGill University, Montréal, Canada.