1. Department of Dermatology, Eberhard-Karls-University; Tübingen Germany
2. Medical Directorate, University Hospital of Zurich, Rämistrasse 100; Zurich Switzerland
3. Department of Dermatology, University Hospital of Zurich; Zurich Switzerland
4. Department of Psychiatry, University of Basel, Wilhelm Klein-Strasse; Basel Switzerland
5. Center for Ophthalmology, Eberhard- Karls-University; Tübingen Germany