1. Division of Rheumatology, Mayo Clinic, Rochester, MN, USA
2. Departments of Medicine/Rheumatology and Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
3. Department of Medicine/Rheumatology, Women’s College Hospital, University of Toronto, 27 King’s College Cir, Toronto, ON M5S, Canada