1Oncology Secretariat B Building Ground Floor, University Hospital of Ioannina, Ioannina, GREECE
2Data Office, Hellenic Cooperative Oncology Group (HeCOG), Athens, Greece
3Medical Oncology Clinic, Papageorgiou Hospital Aristotle University of Thessaloniki, Thessaloniki, GREECE
4Medical Oncology, Ioannina University Hospital, Ioannina, GREECE