[1] Univ Sharjah, Dept Family & Community Med, Sharjah Univ City 27272, Sharjah, U Arab Emirates
[2] Monash Univ, Sch Publ Hlth & Prevent Med, Melbourne, Vic 3004, Australia
[3] Box Hill Hosp, Dept Resp Med, Box Hill, Vic, Australia
[4] Pulmetr Pty Ltd, E Doncaster, Vic, Australia