1. Department of Radiotherapy, West German Cancer Centre, University Hospital Essen, 45147 Essen, Germany
2. National Center for Tumor Diseases (NCT) West, Campus Essen, 45147 Essen, Germany
3. Department of Radiotherapy, Medical Physics Section, University Hospital Essen, 45147 Essen, Germany
4. Department of Ophthalmology, West German Cancer Centre, University Hospital Essen, 45147 Essen, Germany
5. Department of Hematology, West German Cancer Centre, University Hospital Essen, 45147 Essen, Germany
6. Institute for Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, 45147 Essen, Germany
7. Institute of Cell Biology (Cancer Research), Faculty of Medicine, University of Duisburg-Essen, 45147 Essen, Germany
8. German Cancer Consortium (DKTK), Partner Site University Hospital Essen, 45147 Essen, Germany