1. Department of Medicine III, University Medical Center and Faculty of Medicine Carl Gustav Carus at the TU Dresden, Dresden, Germany
2. Department of Medicine, Rheumatology and Clinical Immunology, Charité Universitätsmedizin Berlin & DRFZ Berlin, Berlin, Germany
3. Division of Rheumatology, Department of Medicine, Toronto Western Hospital, Mount Sinai Hospital; Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Canada