1 Department of Dermatology, Allergology and Dermatosurgery, Helios University Hospital Wuppertal, University Witten/Herdecke, Germany.
2 Department of Oncology, Helios University Hospital Wuppertal, University Witten/Herdecke, Germany.
3 Department of Dermatology, Allergology and Dermatosurgery, Helios University Hospital Wuppertal, University Witten/Herdecke, Germany. Electronic address: ulrich.wesselmann@helios-gesundheit.de.