1 Department of Dermatology and Allergology, University Hospital RWTH Aachen, 52074 Aachen, Germany. nalbuscheit@ukaachen.de.
2 Department of Dermatology and Allergology, University Hospital RWTH Aachen, 52074 Aachen, Germany. dkluwig@ukaachen.de.
3 Institute of Pathology, University Hospital RWTH Aachen, 52074 Aachen, Germany. ccacchi@ukaachen.de.
4 Department of Hematology, Oncology, Hemostaseology, and Stem Cell Transplantation, Faculty of Medicine, RWTH Aachen University, Aachen, Germany. myohler@ukaachen.de.
5 Department of Dermatology and Allergology, University Hospital RWTH Aachen, 52074 Aachen, Germany. ayazdi@ukaachen.de.