1. Department of Dermatology and Allergy; University Hospital Mannheim; Mannheim Germany
2. Department of Dermatology and Allergy; University Hospital Munich (LMU); Munich Germany
3. Department of Dermatology; University Hospital Tübingen; Tübingen Germany
4. Department of Dermatology, Venereology and Allergology; Ruhr-University Bochum; Bochum Germany
5. Department of Dermatology; Center for Skin Tumors; Münster-Hornheide; Münster Germany
6. Dermatology Hospital and Skin Tumor Center; Ludwigshafen Hospital; Ludwigshafen Germany
7. Department of Dermatology, Venereology and Allergology; University of Leipzig Medical Centre; Leipzig Germany
8. Department of Dermatology; University Hospital Münster; Münster Germany
9. Department of Dermatology; Hospital of Darmstadt; Darmstadt Germany
10. Department of Biostatistics; University Hospital Mannheim; Mannheim Germany