1. Division of Pulmonology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria
2. Independent Researcher, 42132 Trikala, Greece
3. General Hospital G. Papanikolaou, Pulmonary Department of Aristotle University of Thessaloniki, 57010 Thessaloniki, Greece
4. 1st University Department of Respiratory Medicine, “Sotiria” Chest Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece
5. 2nd Respiratory Medicine Department, “Attikon” University Hospital, National and Kapodistrian University of Athens, 12462 Athens, Greece