1. Cardiovascular Department Division 1, Hebei General Hospital , 348 Heping West Road , Hebei, Shijiazhuang 050000, China
2. Center of Structural Heart Disease, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College , Beilishi Road, Xicheng District , Beijing 100037, China