1 Airway Physiology and Imaging Group and Woolcock Emphysema Centre, The Woolcock Institute of Medical Research, The University of Sydney, Glebe, NSW, Australia; School of Life Sciences, Faculty of Science, University of Technology Sydney, Ultimo, NSW, Australia.
2 Airway Physiology and Imaging Group and Woolcock Emphysema Centre, The Woolcock Institute of Medical Research, The University of Sydney, Glebe, NSW, Australia; The Northern Clinical School, Faculty of Medicine and Health Sciences, The University of Sydney, Sydney, NSW, Australia; Department of Respiratory Medicine, Royal North Shore Hospital, St Leonards, NSW, Australia; NHMRC Centre of Excellence in Severe Asthma, New Lambton Heights, NSW, Australia. Electronic address: ggk@woolcock.org.au.