1. Division of Medical Physics in Radiology; German Cancer Research Center (DKFZ); Heidelberg Germany
2. Division of Radiology; German Cancer Research Center (DKFZ); Heidelberg Germany
3. Faculty of Physics and Astronomy; University of Heidelberg; Heidelberg Germany
4. Faculty of Medicine; University of Heidelberg; Heidelberg Germany
5. Institute of Radiology; University Hospital Erlangen; Erlangen Germany