- Correspondence to Professor Xiao-Ning Zhong, Department of Respiratory Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, China;
- Received December 19, 2016
- Revised May 23, 2017
- Accepted May 29, 2017
- First published July 18, 2017.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.