1. Radiation Oncology Unit, 1st Department of Radiology, Aretaieion Hospital, School of Medicine, National and Kapodistrian University of Athens (NKUOA), 11528 Athens, Greece
2. Medical Physics Unit, 2nd Department of Radiology, Attikon University Hospital, School of Medicine, National and Kapodistrian University of Athens (NKUOA), 12462 Athens, Greece
3. Radiation Oncology Unit, 2nd Department of Radiology, School of Medicine, National and Kapodistrian University of Athens (NKUOA), 12462 Athens, Greece
4. Translational Functional Cancer Genomics, National Center for Tumor Diseases, German Cancer Research Center, 69120 Heidelberg, Germany