1. Chest Diseases Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt
2. Interventional Respiratory Unit, Department of Respiratory Medicine, Galway University Hospitals, Galway, Ireland
3. Department of Respiratory Medicine, University Hospitals Plymouth NHS Trust, Plymouth, UK
4. Pulmonary Medicine Department, King Abdullah Medical City, Makkah, Saudi Arabia
5. Plymouth Medical School, Faculty of Health, University of Plymouth, Plymouth, UK