1 First Department of Pulmonary Medicine and Intensive Care Unit, National and Kapodistrian University of Athens, Medical School, 115 27, Athens, Greece.
2 5Th Respiratory Medicine Department, General Hospital for Chest Diseases of Athens "SOTIRIA", Athens, Greece.
3 Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece.
4 Department of Respiratory Medicine, University General Hospital of Heraklion, Medical School, University of Crete, 71003, Heraklion, Greece.
5 2Nd Respiratory Medicine Department, General Hospital for Chest Diseases of Athens "SOTIRIA", Athens, Greece.
8 Department of Respiratory Medicine, Medical School, University General Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece.
9 Department of Pulmonary Medicine, General Hospital of Thessaloniki "Georgios Papanikolaou", G. Papanikolaou Ave, 57010, Exohi, Greece.
10 Respiratory Medicine Department, University Hospital of Ioannina, Ioannina, Greece.
11 Department of Informatics and Telecommunications, School of Informatics and Telecommunications, University of Ioannina, Arta, Greece.
12 Respiratory Medicine Department, University Hospital of Ioannina, Ioannina, Greece. ktkostikas@gmail.com.