1. Division of Rheumatology and Immunology, University Hospital, Krakow, Poland
2. Research Department, Sørlandet Hospital, Kristiansand, Norway
3. Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA, USA
4. Department of Rheumatology and Immunology, Jagiellonian University Medical College, Krakow, Poland
5. Department of Internal Medicine, Sørlandet Hospital, Kristiansand, Norway
6. Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, NTNU, Norwegian University of Science and Technology, Trondheim, Norway