1. Department of Cardiac Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
2. Department of Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
3. Department of Anesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
4. Department of Hepatic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China