- Correspondence to Professor YM Luo, State Key Laboratory of Respiratory Disease, 151 Yanjiang Road, Guangzhou 510120, China; or Dr R Chen, Department of Respiratory Medicine, Second Affiliated Hospital of Soochow University, Suzhou, China;
- Received 9 February 2016
- Revised 9 September 2016
- Accepted 5 October 2016
- Published online 2 November 2016.
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