1. Centre for Clinical Epidemiology Lady Davis Institute, Jewish General Hospital Montreal Canada
2. Department of Epidemiology, Biostatistics, and Occupational Health McGill University Montreal Canada
3. Department of Medicine McGill University Montréal Canada
4. Division of Pharmacoepidemiology and Pharmacoeconomics Department of Medicine Brigham and Women’s Hospital, Harvard Medical School Boston MA, USA
5. Division of Rheumatology Jewish General Hospital Montreal Canada