1. Dermatologikum Hamburg GmbH Hamburg Germany
2. Department of Dermatology University Medical Centre Hamburg‐Eppendorf Hamburg Germany
3. Department of Medical Statistics and Biomathematics University Medical Centre Mannheim Germany
4. Department of Dermatology Klinikum Ludwigshafen Ludwigshafen am Rhein Germany
5. MVZ Hautzentrum am Kalten Markt GmbH Schwäbisch Gmünd Germany