1. Department of Respiratory Diseases, University Hospital Brno, Brno, Czech Republic.
2. Faculty of Medicine, Masaryk University, Brno, Czech Republic.
3. Institute of Biostatistics and Analyses, Ltd., Brno, Czech Republic.
4. Department of Respiratory Medicine, Thomayer University Hospital, Prague, Czech Republic.
5. 1st Faculty of Medicine, Charles University, Praque, Czech Republic.
6. Department of Respiratory Medicine, University Hospital Olomouc, Olomouc, Czech Republic.
7. Faculty of Medicine, Palacky University, Olomouc, Czech Republic.
8. Department of Pneumology, University Hospital Hradec Kralove, Hradec Kralove, Czech Republic.
9. Faculty of Medicine, Charles University in Prague, Hradec Kralove, Czech Republic.
10. Department of Pneumology, University Hospital Motol, Prague, Czech Republic.
11. 2nd Faculty of Medicine, Charles University, Prague, Czech Republic.
12. Department of Pneumology and Thoracic Surgery, Bulovka Hospital, Prague, Czech Republic.
13. Department of Pneumology, University Hospital Pilsen, Pilsen, Czech Republic.
14. Faculty of Medicine, Charles University in Prague, Pilsen, Czech Republic.