National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens Medical School - 1 st Department of Chest Medicine, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, Northumbria University, National and Kapodistrian University of Athens Medical School - 1 st Department of Chest Medicine and National and Kapodistrian University of Athens