1. Department of Radiotherapy-Oncology, Medical School, Democritus University of Thrace, 68100 Alexandroupolis, Greece
2. Radiation Oncology Unit, 1st Department of Radiology, “Aretaieion” University Hospital, Medical School, National and Kapodistrian University of Athens (NKUOA), 11528 Athens, Greece
3. Department of Pneumonology, Medical School, Democritus University of Thrace, 68100 Alexandroupolis, Greece