1. 5th Department of Respiratory Medicine, Sotiria Thoracic Diseases General Hospital of Athens, 11527 Athens, Greece
2. Laboratory of Molecular and Cellular Pneumonology, Medical School, University of Crete, 71003 Heraklion, Greece
3. Respiratory Physiology Laboratory, Medical School, University of Cyprus, 2029 Nicosia, Cyprus
4. Department of Laboratory Haematology, Georgios Gennimatas General Hospital of Athens, 11527 Athens, Greece