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

Northumbria University, Northumbria University, affiliation not provided to SSRN, Northumbria University and Northumbria University