1. Department of Dermatology and Allergology; Ludwig Maximilians University; Munich Germany
2. Department of Dermatology; University Medical Center; Regensburg Germany
3. Department of Dermatology; Tübingen Germany
4. Department of Dermatology and Venereology; University Hospital; Otto von Guericke University; Magdeburg Germany
5. Department of Dermatology and Allergology; Medical Center Oldenburg; Oldenburg Germany
6. Department of Dermatology; General Hospital of Vienna; Vienna Austria
7. Department of Dermatology; Allergology and Dermatosurgery; HELIOS-Medical Center; Wuppertal Germany
8. Department of Dermatology and Allergology; University Medical Center; Ulm Germany
9. Department of Dermatology; Kiel Germany
10. Department of Dermatology; Venereology and Allergology; University Medical Center; Leipzig Germany