1. RHIO (Rheumatology; Immunology, Osteology) Düsseldorf and RHIO Research Institute; Düsseldorf Germany
2. Department of Medicine III; Rheumatology; Helios St. Johannes Medical Center; Duisburg Germany
3. Department of Internal Medicine - Rheumatology and Clinical Immunology; Weißensee Medical Center; Berlin Germany
4. Department of Dermatology and Allergology; Evangelical Hospital; Düsseldorf; and Faculty of Health; Department of Medicine; University of Witten/Herdecke; Germany