1. Department of Respiratory Medicine, Royal North Shore Hospital, St. Leonards, New South Wales, Australia
2. Airway Physiology and Imaging Group, The Woolcock Institute of Medical Research, The University of Sydney, Sydney, New South Wales, Australia
3. National Health and Medical Research Council Centre of Excellence in Severe Asthma, New Lambton Heights, New South Wales, Australia
4. Faculty of Science, School of Life Sciences, University of Technology Sydney, Ultimo, New South Wales, Australia
5. Department of Nuclear Medicine, Royal North Shore Hospital, St. Leonards, New South Wales, Australia
6. Faculty of Health and Medicine, Northern Clinical School, University of Sydney, New South Wales, Australia
7. Macquarie Medical Imaging, Macquarie University Hospital, Macquarie University, New South Wales, Australia
8. Faculty of Medicine and Health Sciences, Macquarie University, New South Wales, Australia
9. Department of Respiratory Medicine, Westmead Hospital, Westmead, New South Wales, Australia