[1] South Western Sydney Local Hlth Dist, Campbelltown & Camden Hosp, Dept Resp & Sleep Med, Sydney, NSW, Australia
[2] Univ New South Wales, South Western Sydney Clin Sch, Sydney, NSW, Australia
[3] Western Sydney Local Hlth Dist, Westmead Hosp, Dept Resp & Sleep Mecidine, Sydney, NSW, Australia
[4] Western Sydney Univ, Sch Nursing & Midwifery, Sydney, NSW, Australia
[5] Univ Queensland, Greater Brisbane Clin Sch, Fac Med, Brisbane, Qld, Australia
[6] Western Sydney Univ, Sch Med, Sydney, NSW, Australia