1. Department of Dermatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
2. Department of Dermatology, Lausanne University Hospital CHUV, University of Lausanne, Lausanne, Switzerland
3. Department of Dermatology, Kantonal Hospital St. Gallen, St. Gallen, Switzerland
4. Department of Dermatology, Kepler University Hospital, Linz, Austria
5. Department of Immunology, Medical University of Warsaw, Warsaw, Poland