1. Department of Dermatology Eberhard Karls Universität Tübingen Tübingen Germany
2. Department of Dermatology, Venereology and Allergology Charité – Universitätsmedizin Berlin Corporate Member of Freie Universität Berlin and Humboldt‐Universität zu Berlin Berlin Germany
3. Deptartment of Clinical Epidemiology and Biostatistics Eberhard Karls Universität Tübingen Tübingen Germany