1. Department of Dermatology, Christian Hospital Unna, 59423 Unna, Germany
2. Skin Cancer Center, Department of Dermatology, Ruhr-University Bochum, 44791 Bochum, Germany
3. Institute of Pathology, Ruhr-University Bochum, 44789 Bochum, Germany
4. MVZ Dermatopathology, 88048 Friedrichshafen, Germany