[1] Univ Technol Sydney, Croydon Pk, NSW, Australia
[2] Woolcock Inst Med Res, Airway Physiol & Imaging Grp, Glebe, NSW, Australia
[3] Woolcock Inst Med Res, Woolcock Emphysema Ctr, Glebe, NSW, Australia
[4] Univ Sydney, Fac Sci, Camperdown, NSW, Australia
[5] Univ Sydney, Fac Engn, Camperdown, NSW, Australia
[6] Royal North Shore Hosp, Dept Nucl Med, St Leonards, NSW, Australia
[7] Royal North Shore Hosp, Dept Resp Med, St Leonards, NSW, Australia
[8] Univ Sydney, Fac Med & Hlth, Camperdown, NSW, Australia