Stephan Große-Büning, Medicorium, Oberursel, Germany; Department of Dermatology, University Medical Center, Mainz, Germany Florian Butsch, Department of Dermatology, University Medical Center, Mainz, Germany Marie Leger, Skin Cancer and Dermatology Institute, Nevada, USA Stephan Grabbe, Department of Dermatology, University Medical Center, Mainz, Germany