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