[1] Inst Resp Hlth, Pleural Med Unit, Perth, Australia
[2] Edith Cowan Univ, Sch Med & Hlth Sci, Perth, Australia
[3] Sir Charles Gairdner Hosp, Dept Resp Med, Perth, Australia
[4] Univ Hosp Wales, Dept Resp Med, Cardiff, Wales
[5] Northern Hlth, Dept Resp Med, Melbourne, Australia
[6] Univ Melbourne, Fac Med Dent & Hlth Sci, Parkville, Vic, Australia
[7] Univ Hong Kong, Queen Mary Hosp, Div Resp Med, Hong Kong, Angola
[8] Univ Western Australia, Sch Med, Perth, Australia
[9] QE II Med Ctr, 533 Perkins Bldg, Perth, WA 6009, Australia