1. Division of Rheumatology, Department of Medicine (Solna), Karolinska Institutet, Stockholm, Sweden, and Division of Rheumatology, Department of Internal Medicine 3, Medical University of Vienna Vienna Austria
2. Division of Rheumatology, Department of Internal Medicine 3 Medical University of Vienna Vienna Austria
3. EULAR Community of People with Arthritis/Rheumatism in Europe (PARE) Zürich Switzerland
4. Institute for Outcomes Research, Center for Medical Statistics, Informatics, and Intelligent Systems Medical University of Vienna Vienna Austria
5. Division of Rheumatology, Department of Medicine University of British Columbia and Arthritis Research Canada Vancouver Canada
6. Section of Rheumatology Boston University School of Medicine Boston Massachusetts