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. Department of Rehabilitation Medicine, Serdang Hospital, Selangor, Malaysia
5. Bangladesh Primary Care Respiratory Society, Khulna, Bangladesh
6. NIHR Global Health Research Unit on Respiratory Health (RESPIRE), Usher Institute, University of Edinburgh, Edinburgh, UK