Published on in Vol 23, No 9 (2021): September
1 NIHR Global Health Research Unit on Respiratory Health (RESPIRE), Usher Institute, The University of Edinburgh, Edinburgh, United Kingdom
2 Department of Family Medicine, Medical Faculty and Health Sciences, Universiti Putra Malaysia, Serdang, Malaysia
3 UM eHealth Unit, Faculty of Medicine, University Malaya, Petaling Jaya, Malaysia
4 Malaysian Research Institute on Ageing, Universiti Putra Malaysia, Serdang, Malaysia
5 Centre for Biomedicine, Self and Society, Usher Institute, University of Edinburgh, Edinburgh, United Kingdom
*these authors contributed equally