1. Center of Experimental Rheumatology, Department of Rheumatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland
2. Department of Rheumatology and Immunology, Inselspital, Bern University Hospital, University of Bern, 3008 Bern, Switzerland
3. Department for BioMedical Research, University of Bern, 3008 Bern, Switzerland
4. Department of Rheumatology, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia
5. Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia