1. 2nd Respiratory Medicine Department, “Attikon” University Hospital, National and Kapodistrian University of Athens Medical School, 11527 Athens, Greece
2. School of Medicine, Institute of Molecular Biology and Biotechnology, University of Crete, Foundation for Research and Technology—Hellas Voutes, 71110 Heraklion, Crete, Greece
3. 5th Respiratory Medicine Department, “Sotiria” Chest Hospital, 11527 Athens, Greece
4. 1st Respiratory Medicine Department, “Sotiria” Chest Hospital, National and Kapodistrian University of Athens Medical School, 11527 Athens, Greece