- Correspondence to Dr Xu Li, Nanyang Second General Hospital, No. 66 Jianshe East Road, Wancheng District, Nanyang, Henan, China;
- Accepted August 20, 2017
- First published February 27, 2018.
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.