1. Division of Medical Physics, Department of Diagnostic and Interventional Radiology, University Medical Center Freiburg, Faculty of Medicine University of Freiburg Freiburg Germany
2. Medical Image Computing Group, Department of Informatics University of Bremen Bremen Germany
3. Fraunhofer Institute for Digital Medicine MEVIS Bremen Germany
4. Department of Orthopedic and Trauma Surgery, University Medical Center Freiburg, Faculty of Medicine University of Freiburg Freiburg Germany