1 Department of Dermatology, Venereology, and Allergology, Helios St. Elisabeth Hospital Oberhausen, University of Witten-Herdecke, Oberhausen, Germany.
2 Department of Dermatology, Venereology, and Allergology, Helios St. Elisabeth Hospital Oberhausen, University of Witten-Herdecke, Oberhausen, Germany a.kreuter@derma.de.