1. Respiratory Medicine Department, ‘Attikon’ University Hospital, Athens Medical School, National and Kapodistrian University of Athens, Athens, Greece
2. Division of Immunology, Biomedical Sciences Research Center ‘Alexander Fleming,’, Athens, Greece
3. First Academic Department of Pneumonology, Hospital for Diseases of the Chest, ‘Sotiria,’ Medical School, National and Kapodistrian University of Athens, Athens, Greece