1. Vascular Ultrasonography Department, Xuanwu Hospital, Capital Medical University, Beijing 100053, P.R. China
2. Structural Heart Disease Department, Fuwai Hospital, Chinese Academy of Medical Sciences, Beijing 100037, P.R. China
3. Radiology Department, Daqing Longnan Hospital, Daqing, Heilongjiang 163453, P.R. China
4. Traditional Chinese Medicine Department, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing 100053, P.R. China