[1] Inst Resp Hlth, Pleural Med Unit, Perth, WA, Australia
[2] Edith Cowan Univ, Sch Med & Hlth Sci, Perth, WA, Australia
[3] Sir Charles Gairdner Hosp, Dept Resp Med, Perth, WA, Australia
[4] St John God Hlth Care, Dept Resp Med, Perth, WA, Australia
[5] Univ Western Australia, Sch Med, Perth, WA, Australia