1. Department of Cardiovascular Surgery, National Center for Cardiovascular Diseases and Fuwai Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
2. Department of Ultrasound, National Center for Cardiovascular Diseases and Fuwai Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
3. Department of Anesthesiology, National Center for Cardiovascular Diseases and Fuwai Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China