1. Department of Dermatology and Venereology University Hospital Halle, Martin‐Luther‐University Halle‐Wittenberg and Department of Translational Dermatoinfectiology University of Münster Münster Germany
2. Department of Rheumatology and Clinical Immunology Vasculitis Center Schleswig‐Holstein University Medical Center Campus Lübeck Lübeck Germany
3. Department of Internal Medicine Hospital Saint‐Louis University Paris Diderot Paris France
4. Department of Dermatology Münster University Medical Center Münster Germany
5. Department of Dermatology and Venereology Innsbruck Medical University Innsbruck Austria