1. Skin Cancer Center Charité; Department of Dermatology and Allergy; Charité-Universitätsmedizin Berlin; 10117 Berlin Germany
2. Institute of Biometry and Epidemiology; Charité-Universitätsmedizin Berlin; 10117 Berlin Germany
3. Clinic for Dermatology; Venerology and Allergology; St. Josef-Hospital Bochum - University Hospital of the Ruhr-Universität Bochum; 44791 Bochum Germany