1. Department of Dermatology Venereology and Allergology Charité – Universitätsmedizin Berlin Berlin Germany
2. Institute for Health Services Research in Dermatology and Nursing University Medical Center Hamburg Hamburg Germany
3. Center for Rheumatology Katholische Kliniken Rhein‐Ruhr Herne Germany
4. Clinic for Inner Medicine 3 (Rheumatology and Immunology) University Hospital Erlangen Erlangen Germany
5. Polyclinic and Functional Area for Rheumatology University Hospital Düsseldorf Düsseldorf Germany
6. Institute of Clinical Molecular Biology Christian Albrechts University Kiel Kiel Germany
7. Division of Rheumatology and Clinical Immunology Department of Medicine IV University of Munich Munich Germany
8. Medical Clinic I – University Hospital Dresden and Center for Regenerative Therapies Dresden (CRTD) Dresden Germany
9. Institute for Inflammatory Medicine University Hospital Schleswig‐Holstein Campus Lübeck Lübeck Germany