1 Department of Anesthesiology, Peking Union Medical College Hospital; Department of Cardiopulmonary Bypass, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China.
2 Department of Anesthesiology, Peking Union Medical College Hospital, Beijing 100730, China.
3 Department of Cardiopulmonary Bypass, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China.