1 School of Medicine and Public Health, Centre for Asthma and Respiratory Disease, The University of Newcastle.
2 Department of Respiratory and Sleep Medicine, John Hunter Hospital, Newcastle.
3 Inflammation and Infection Research Centre and Prince of Wales' Hospital Clinical School, Faculty of Medicine, University of New South Wales, Kensington.
4 Department of Respiratory Medicine, Prince of Wales' Hospital, Randwick, New South Wales, Australia.
5 Department of Medicine and Department of Pharmacology and Pharmacy, The University of Hong Kong, Hong Kong, China.
6 Helen and Arthur E. Johnson Beth-El College of Nursing and Health Sciences, University of Colorado Colorado Springs, Colorado, USA.
7 Department of Medicine, National University Hospital, Singapore.
8 Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, China.