1. Department of Pulmonology and Internal Medicine, Weill-Cornell Medicine & Hamad General Hospital, Doha, Qatar
2. Department of Internal Medicine, Hamad General Hospital, Doha, Qatar
3. Department of Respiratory Medicine, University Hospital of Leicester, Leicester, UK
4. Department of Medicine, Cavan General Hospital, Cavan, Ireland
5. Department of Cardiology, Heart Hospital, Hamad Medical Corporation, Doha, Qatar