- Correspondence to Dr Xianliang Zhou, Department of Cardiology, FuWai Hospital and Cardiovascular Institute, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China; Dr Li Fan, Department of Geriatric Cardiology, General Hospital of Chinese People's Liberation Army, Beijing 100853, China;
- Accepted April 16, 2012
- First published May 8, 2012.
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