1. Department of Dermatology and Phlebology, Christian Hospital Unna, 59423 Unna, Germany
2. Department of Dermatology, Klinikum Dortmund gGmbH, 44123 Dortmund, Germany
3. Department of Dermatology, Ruhr-University Bochum, 44791 Bochum, Germany
4. Hematopathology Lübeck, 23562 Lübeck, Germany