1. Division of Rheumatology, Geneva University Hospitals , Geneva , Switzerland
2. Geneva Centre for Inflammation Research, Faculty of Medicine, University of Geneva , Geneva , Switzerland
3. Department of Rheumatology, Zurich University Hospital, University of Zurich , Zurich , Switzerland
4. Swiss Clinical Quality Management Foundation , Zurich , Switzerland
5. Division of Rheumatology and Immunology, St. Gallen Cantonal Hospital , St. Gallen , Switzerland