1. Department of Dermatology, Venereology and Allergology; HELIOS-Klinikum Hildesheim; Hildesheim Germany
2. Clinic of Dermatology, Venereology and Allergology; University Medical Center Göttingen; Germany
3. Department of Dermatology, Hospital Universitario de la Princesa; Universidad, Autónoma; Madrid Spain
4. Department of Dermatology; Fachklinik Hornheide; Münster Germany
5. Dermatopathologie Friedrichshafen; Friedrichshafen Germany