1. Medical Faculty Ljubljana, University Clinic Golnik, Ljubljana, Slovenia
2. Department of Medical Oncology, “Prof. Dr. Ion Chiricuta" Institute of Oncology, Cluj-Napoca, Romania
3. Department of Oncology, Hospital of St Zoerardus Zobor, Nitra, Slovakia
4. Department of Chest Surgery, Pest County Pulmonology Hospital, Törökbálint, Hungary
5. Department for Respiratory Disease Jordanovic, University Hospital Centre Zagreb, Zagreb, Croatia
6. Department of Oncology and Radiotherapy, Medical University of Gdansk, Gdansk, Poland
7. Department of Palliative Medicine, University Hospital of Pulmonology, Clinical Center of Serbia, Belgrade, Serbia
8. Department of Medical Oncology, Military Medical Academy, Sofia, Bulgaria
9. Department of Pulmunology, National Koranyi Institute of Pulmunology, Budapest, Hungary
10. Department of Medicine I, Medical University of Vienna – General Hospital, Vienna, Austria and Central European Cooperative Oncology Group (CECOG)
11. Department of Oncology, University Hospital, Prague, Czech Republic
12. Vienna Cancer Center, Medical University of Vienna – General Hospital, Vienna, Austria and Central European Cooperative Oncology Group (CECOG)