- Correspondence to Wenquan Niu, Associate Professor, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China; or Yue Qi, Assistant Professor, Beijing An Zhen Hospital, Capital Medical University, Beijing 100029, China;
- Received March 21, 2011
- Revised May 6, 2012
- Accepted May 15, 2012
- First published June 11, 2012.
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.