1. From the Division of Clinical Epidemiology (E.V., S.S., A.E.C., S.B.), Division of Rheumatology (E.V., C.A.P., S.B.), McGill University Health Centre, Montreal, Canada; Division of Rheumatology, University of Calgary, Calgary, Canada (A.E.C.); and Department of Epidemiology, Biostatistics & Occupational Health, McGill University, Montreal, Canada (R.W.P.).