1 Department of Cardiopulmonary Bypass, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 167, N Lishi Rd, Xicheng District, Beijing, China.
2 Department of Cardiopulmonary Bypass, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 167, N Lishi Rd, Xicheng District, Beijing, China. Electronic address: liujinping@fuwai.com.