- Correspondence to Professor Xiao-Ning Zhong, Department of Respiratory Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, China;
- Received 19 December 2016
- Revised 23 May 2017
- Accepted 29 May 2017
- Published in print 1 December 2017.
- Published online 15 November 2017.
- Published first 18 July 2017.
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