- Correspondence to Shuzheng Lv, Department of Cardiology, Beijing An Zhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Disease, Anzhenli Avenue, Chao Yang District, Beijing 100029, China;
- Received July 30, 2014
- Revised November 18, 2014
- Accepted December 9, 2014
- First published January 30, 2015.
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