1. State Key Laboratory of Cardiovascular Disease, Cardiac Arrhythmia Centre, Fuwai Hospital, National Centre for Cardiovascular Diseases Chinese Academy of Medical Sciences and Peking Union Medical College No. 167 Beilishi Road, Xicheng Beijing China
2. Department of Cardiology The First Affiliated Hospital of Zhengzhou University 1 Jianshe E Rd, Erqi District Zhengzhou Henan China
3. Department of Cardiology The Second Hospital of Hebei Medical University Shijiazhuang China
4. Department of Echocardiography, Fuwai Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China