1. Department of Radiology, St. Savvas Anticancer Hospital of Athens, Athens, Greece
2. Department of Radiotherapy, Faculty of Medicine, School of Health Sciences, University of Thessaly, Biopolis, Larisa, Greece
3. Department of Oncology, Veterans Hospital (NIMTS), Athens, Greece
4. Second Department of Medical Oncology, St. Savvas Anticancer Hospital of Athens, Athens, Greece