1. Department of Respiratory and Critical Care Medicine, Karl-Landsteiner-Institute for Lung Research and Pulmonary Oncology, Vienna Health Care Group, Vienna, Austria
2. Department of Pulmonology, Pirogov Russian State National Research Medical University, Moscow, Russia
3. Pulmonology Department, I.M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
4. Department of Pneumology, Faculty of Medicine in Hradec Kralove, Charles University Hospital, Hradec Kralove, Czech Republic
5. University Hospital Martin, Jessenius Faculty of Medicine, Commenius University, Martin, Slovakia
6. Department for Respiratory Pathophysiology and Sleep Disordered Breathing, The Institute for Pulmonary Diseases of Vojvodina, Sremska Kamenica, Serbia
7. Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia
8. Adult Pulmonary Department, Institute for Pulmonary Diseases, Törökbálint, Hungary
9. Pulmonology Department, Iuliu Hațieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
10. Department of Internal Diseases, Faculty Medicine, University of Latvia, Riga, Latvia
11. School of Medicine, University of Zagreb, Zagreb, Croatia
12. First Department of Lung Diseases and Chemotherapy of Respiratory Neoplasms, Medical University of Bialystok, Bialystok, Poland
13. Department of Pulmonary Diseases, Medical University of Sofia, Sofia, Bulgaria