1. Department of Radiation Oncology and CyberKnife Center, Faculty of Medicine, University Hospital Cologne, University of Cologne, Cologne, Germany
2. Center for Molecular Medicine Cologne, Faculty of Medicine, University Hospital Cologne, University of Cologne, Cologne, Germany
3. Center of Integrated Oncology (CIO), Universities of Aachen, Bonn, Cologne, and Duesseldorf, Cologne, Germany
4. Department I of Internal Medicine, Faculty of Medicine, University Hospital Cologne, University of Cologne, Cologne, Germany