1. Division of Pulmonology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
2. Pulmonologist, Trikala, Greece
3. 1st Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens, Alexandra Hospital, Athens, Greece
4. Department of Thoracic Surgery and Thoracic Endoscopy, Ruhrlandklinik, West German Lung Center, University Hospital Essen, University Duisburg-Essen, Essen, Germany
5. 2nd Respiratory Medicine Department, Attikon University Hospital, Athens, Greece
6. Department of Pathology, Attikon University Hospital, Athens Medical School, National and Kapodistrian University of Athens, Athens, Greece
7. Department of Respiratory Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
8. 1st University Department of Respiratory Medicine, Sotiria Hospital, National and Kapodistrian University of Athens, Athens, Greece