Manali Mukherjee1, Petros Bakakos2, Stelios Loukides3. 1. Department of Medicine, Division of Respirology, McMaster University, Hamilton & Firestone Institute for Respiratory Health, St Joseph's Healthcare, Hamilton, ON, Canada. 2. 1st Respiratory Medicine Department, National and Kapodistrian University of Athens Medical School, Athens, Greece. 3. 2nd Respiratory Medicine Department, National and Kapodistrian University of Athens Medical School, Athens, Greece.