[1] Curtin Univ, Sch Physiotherapy & Exercise Sci, Fac Hlth Sci, Bentley, WA, Australia
[2] Univ Teknol MARA, Communities Res CoRe Humanities & Qual Life, Shah Alam, Selangor, Malaysia
[3] Sir Charles Gairdner Hosp, Lung Inst Western Australia, Nedlands, WA, Australia
[4] Sir Charles Gairdner Hosp, Physiotherapy Dept, Nedlands, WA, Australia
[5] Univ Teknol MARA, Fac Med, Selayang Campus, Batu Caves, Selangor, Malaysia
[6] Inst Resp Med, Dept Resp Med, Kuala Lumpur, Malaysia