1. Department of Medical Oncology, University Hospital of Ioannina, Ioannina, Greece
2. Department of Biostatistics and Clinical Bioinformatics, Faculty of Medicine, University of Thessaly, Larissa, Greece
3. 2nd Department of Medical Oncology, University Hospital Attikon, Athens, Greece
4. Department of Medical Oncology, University General Hospital of Heraklion, Heraklion, Crete, Greece
5. Department of Oncology, University General Hospital of Larissa, Larissa, Greece