1. Department of Nuclear Medicine, West German Cancer Center, University Hospital Essen, Essen, Germany
2. German Cancer Consortium (DKTK), Partner site University Hospital Essen, Essen, Germany
3. Department of Nuclear Medicine, University Hospital Münster, Münster, Germany
4. Department of Medicine, Ruhr-University Bochum, University Hospital, Knappschaftskrankenhaus Bochum, Bochum, Germany
5. Institute of Pathology, University Hospital Essen, University Duisburg-Essen, Essen, Germany