1. Institute of Immunobiology, Kantonsspital St. Gallen St. Gallen Switzerland
2. Department of Dermatology University Hospital Tübingen, University of Tübingen Tübingen Germany
3. Department of Dermatology Kantonsspital St. Gallen St. Gallen Switzerland
4. Department of Dermatology University Hospital Zurich, University of Zurich Zurich Switzerland
5. Department of Oncology and Hematology Kantonsspital St. Gallen St. Gallen Switzerland