Department of Anesthesiology, Fuwai Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing 100037, China;
Department of Echocardiography, Fuwai Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing 100037, China;
Department of Anesthesiology, Fuwai Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing 100037, China;