1. Department of Dermatology, Venerology and Allergology, University Hospital-Essen, University of Duisburg-Essen, Essen, Germany
2. West German Cancer Center, University Duisburg-Essen, Essen, Germany
3. German Consortium for Translational Cancer Research, Partner Site, University Hospital-Essen, Essen, Germany
4. Department of Nuclear Medicine, University Essen-Duisburg, University of Duisburg, Essen, Germany