- 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 May 18, 2016
- Revised October 14, 2016
- Accepted October 17, 2016
- First published December 9, 2016.
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