1. Respiratory Group, Department of Integrated Traditional Chinese and Western Medicine, West China Hospital, Sichuan University, Chengdu, China.
2. Priority Research Centre for Asthma and Respiratory Diseases, University of Newcastle; Hunter Medical Research Institute, Newcastle, NSW, Australia.
3. Department of Respiratory and Sleep Medicine, John Hunter Hospital, New Lambton, NSW, Australia.
4. School of Nursing and Midwifery, Faculty of Health, University of Newcastle, NSW, Australia.
5. Woolcock Institute of Medical Research, Sydney NSW, Australia.