- Correspondence to Dr Wanmu Xie, Department of Respiratory and Critical Care Medicine, China-Japan Friendship Hospital, 2 Yinghua Dongjie, ChaoYang District, Beijing 100029, China;
- Received June 17, 2016
- Revised August 9, 2016
- Accepted October 12, 2016
- First published November 4, 2016.
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