1. Interdisciplinary Center for Clinical Trials (IZKS); University Medical Center Mainz; Mainz Germany
2. Division of Immunogenetics; German Cancer Research Center; Heidelberg Germany
3. Department of Dermatology; University of Bonn; Bonn Germany
4. Department of Dermatology and Allergology; Klinikum Bremen Mitte; Bremen Germany
5. Institute of Biostatistics and Clinical Research; University of Muenster; Muenster Germany
6. Department of Dermatology; University Clinic Basel; Basel Switzerland
7. Department of Dermatology; University Clinic Zürich; Zürich Switzerland