- Correspondence to Dr Ruchong Chen, Respirology, State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, China;
- Received December 16, 2018
- Revised May 18, 2019
- Accepted June 23, 2019
- First published July 11, 2019.
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