1. Department of Dermatology Eberhard Karls University Tuebingen Germany
2. Institute of Pathology and Neuropathology Eberhard Karls University Tuebingen Germany
3. Clinic and Polyclinic for Dermatology University Hospital Regensburg Regensburg Germany
4. Department of Dermatology and Allergology University Hospital RWTH Aachen Aachen Germany