1. Department of Diagnostic and Interventional Radiology, University of Heidelberg, Heidelberg, Germany
2. Department of Medical Physics in Radiology, German Cancer Research Center, Heidelberg, Germany
3. Departments of Experimental Molecular Imaging and Diagnostic Radiology, Medical Faculty, Rheinisch-Westfälische Technische Hochschule Aachen University, Aachen, Germany
4. Department of Medical and Biological Informatics, German Cancer Research Center, Heidelberg, Germany