1. School of Medicine and Pharmacology, University of Western Australia, Perth, Western Australia, Australia
2. Institute for Respiratory Health, Nedlands, Western Australia, Australia
3. Pharmacy Department, and
4. Respiratory Medicine Department, Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia
5. Academic Respiratory Unit, School of Clinical Sciences, University of Bristol, Bristol, United Kingdom
6. Queen Elizabeth University Hospital, Glasgow, United Kingdom
7. Respiratory Department, Wellington Regional Hospital, Wellington, New Zealand
8. Respiratory Medicine Department, St. John of God Midland, Midland, Western Australia, Australia; and
9. Department of Radiology, North Bristol NHS Trust, Bristol, United Kingdom