1. Second Department of Internal Medicine, Agios Savvas Cancer Hospital, 11522 Athens, Greece
2. Oncology Department, Hygeia Hospital, 15123 Athens, Greece
3. Section of Biostatistics, Hellenic Cooperative Oncology Group, 11526 Athens, Greece
4. Laboratory of Molecular Oncology, Hellenic Foundation for Cancer Research/Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
5. Second Department of Medical Oncology, Metropolitan Hospital, 18547 Piraeus, Greece
6. Department of Medical Oncology, Medical School, University of Ioannina, 45500 Ioannina, Greece
7. First Department of Medical Oncology, Metropolitan Hospital, 18547 Piraeus, Greece
8. Department of Histopathology, Agii Anargiri Cancer Hospital, 14564 Athens, Greece
9. Department of Pathology, Alexandra Hospital, 11528 Athens, Greece
10. Pathology Department, Evangelismos Hospital, 10676 Athens, Greece
11. Division of Oncology, Department of Medicine, University Hospital, University of Patras Medical School, 26504 Patras, Greece
12. Oncology Unit, Hippokration Hospital, 11527 Athens, Greece
13. Department of Medical Oncology, University Hospital of Heraklion School of Medicine, University of Crete, 71500 Crete, Greece
14. Third Department of Medical Oncology, Hygeia Hospital, 15123 Athens, Greece
15. Section of Medical Oncology, Department of Internal Medicine, Attikon University Hospital, Faculty of Medicine, National and Kapodistrian University of Athens School of Medicine, 12462 Athens, Greece
16. Oncology Section, Second Department of Internal Medicine, Hippokration Hospital, 11527 Athens, Greece
17. Third Department of Medical Oncology, Agii Anargiri Cancer Hospital, Kifissia 14564 Athens, Greece