- Correspondence to Dr Pixin Ran, The State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, The First Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 510120, China;
- Received 18 May 2016
- Revised 14 October 2016
- Accepted 17 October 2016
- Published in print 1 September 2017.
- Published online 21 August 2017.
- Published first 9 December 2016.
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