- Correspondence to Dr Qiang Sun, Department of Cardiology, The First Hospital of Qinhuangdao, No. 258, Wenhua Road, Qinhuangdao, Hebei Province 066000, China;
- Received March 9, 2016
- Revised March 24, 2016
- Accepted March 29, 2016
- First published April 21, 2016.
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.