1. Department of Rehabilitation Medicine, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
2. Department of Primary Care Medicine, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
3. Department of Medicine, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
4. Faculty of Health Sciences, University Teknologi MARA (UiTM), Puncak Alam, Selangor, Malaysia
5. Department of Rehabilitation Medicine, Serdang Hospital, Selangor, Malaysia
6. NIHR Global Health Research Unit on Respiratory Health (RESPIRE), Usher Institute, University of Edinburgh, Edinburgh, UK
7. International Primary Care Respiratory Group (IPCRG), Edinburgh, UK