[1] Univ Western Australia, Royal Perth Hosp, Perth, WA 6009, Australia
[2] Alfred Hosp, Dept Resp Med, Melbourne, Vic, Australia
[3] Lung Fdn Australia, Brisbane, Qld, Australia
[4] Univ Tasmania, Dept Med, Hobart, Tas, Australia
[5] Royal Adelaide Hosp, Adelaide, SA 5000, Australia
[6] Prince Charles Hosp, Brisbane, Qld 4032, Australia
[7] Royal Brisbane & Womens Hosp, Brisbane, Qld, Australia
[8] Royal Prince Alfred Hosp, Sydney, NSW, Australia
[9] Univ Sydney, Sydney Med Sch, Sydney, NSW 2006, Australia
[10] Univ Western Sydney, Sch Med, Sydney, NSW, Australia
[11] Royal Prince Alfred Hosp, Dept Radiol, Sydney, NSW, Australia
[12] Royal Prince Alfred Hosp, Dept Resp Med, Sydney, NSW, Australia