1. Department of Rheumatology and Clinical Immunology, Charité – Universitätsmedizin Berlin , Berlin, Germany
2. Section for Biostatistics and Evidence-Based Research, The Parker Institute, Bispebjerg and Frederiksberg Hospital , Copenhagen, Denmark
3. Division of Rheumatology, University of California San Francisco , San Francisco, CA, USA
4. Research Unit of Rheumatology, Department of Clinical Research, University of Southern Denmark, Odense University Hospital , Odense, Denmark
5. Department of Epidemiology and Biostatistics, and Amsterdam Rheumatology and Immunology Center, Amsterdam UMC, Vrije Universiteit Amsterdam , Amsterdam, The Netherlands
6. Rheumatology Department, Centro Hospitalar e Universitário de Coimbra, Portugal, and Institute for Clinical and Biomedical Research (i.CBR) Faculty of Medicine, University of Coimbra , Coimbra, Portugal
7. University of Bristol , Bristol, UK
8. Rheumazentrum Ratingen , Ratingen, Germany
9. Department of Rheumatology, Hospital of Brunico (SABES-ASDAA) , Brunico, Italy
10. Department of Rheumatology and Immunology, Medical University of Graz , Graz, Austria