- Correspondence to Dr Chunsheng Li, Department of Emergency Medicine, Beijing Chao-yang Hospital, Capital Medical University, No. 8 Gongti South Street, Chao-yang District, Beijing 100020, China;
- Received December 9, 2013
- Revised December 20, 2013
- Accepted December 21, 2013
- First published January 7, 2014.
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.