1. Department of Medicine, McGill University , Montreal, Canada
2. Division of Rheumatology, Department of Medicine, Jewish General Hospital , Montreal, Canada
3. Division of Rheumatology, Department of Medicine, University of British Columbia , Vancouver, Canada
4. Department of Rheumatology, Odense University Hospital , Odense, Denmark
5. Department of Rheumatology, Rigshospitalet , Copenhagen, Denmark