[1] Univ Cape Town, Div Pulmonol, Cape Town, South Africa
[2] Univ Cape Town, Dept Med, Cape Town, South Africa
[3] Univ Sydney, Woolcock Inst Med Res, Sydney, NSW, Australia
[4] McMaster Univ, St Josephs Healthcare, Firestone Inst Resp Hlth, Hamilton, ON, Canada
[5] McMaster Univ, Michael G DeGroote Sch Med, Dept Med, Hamilton, ON, Canada
[6] Imperial Coll, Natl Heart & Lung Inst, Airway Dis Sect, London, England
[7] Guangzhou Med Univ, Affiliated Hosp 1, State Key Lab Resp Dis, Guangzhou, Guangdong, Peoples R China
[8] AstraZeneca R&D, Gothenburg, Sweden
[9] AstraZeneca, Barcelona, Spain
[10] AstraZeneca, Warsaw, Poland
[11] Univ British Columbia, Inst Heart & Lung Hlth, Vancouver, BC, Canada