1 Department of Dermatology and Phlebology, Christian Hospital Unna, Unna, Germany.
2 Skin Cancer Center, Department of Dermatology, Ruhr-University Bochum, Bochum, Germany.
3 Hematopathology Section and Lymph Node Registry, Institute of Pathology Christian-Albrechts University Kiel and University Hospital Schleswig-Holstein, Germany.