1. Department of Dermatology, Allergology, and Venereology - Division of Dermatohistology - Saarland University; Homburg/Saar Germany
2. Saarland University Hospital, Institute for Medical Biometrics, Epidemiology, and Medical Informatics; Homburg/Saar Germany
3. Department of Dermatology, Venereology, Allergology, and Phlebology, Mühlenkreiskliniken, Johannes Wesling Hospital Minden; Minden Germany
4. University of Münster, Department of Dermatology; Münster Germany