[1] Southern Adelaide Local Hlth Network, Dept Resp Med, Adelaide, SA, Australia
[2] Flinders Univ S Australia, Sch Med, Adelaide, SA, Australia
[3] Swinburne Univ, Dept Stat Data Sci & Epidemiol, Melbourne, Vic, Australia
[4] King Saud bin Abdulaziz Univ Hlth Sci, Coll Med, Dept Med, Riyadh, Saudi Arabia
[5] Sleep Hlth Serv, Southern Adelaide Local Hlth Network, Adelaide, SA, Australia