1. Department of Anesthesiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
2. Department of Anesthesiology, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
3. Department of Anesthesiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
4. Department of Anesthesia, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China
5. Department of Anesthesiology, Chongqing People’s Hospital, Chongqing, China
6. Department of Anesthesiology, Fujian Medical University Union Hospital, Fuzhou, China
7. Department of Anesthesiology and Perioperative Medicine, Henan Provincial People’s Hospital, People’s Hospital of Zhengzhou University, Zhengzhou, China
8. Department of Anesthesiology, the Fourth Hospital of Hebei Medical University, Shi-Jia-Zhuang, China
9. Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Air Force Military Medical University, Xi’an, China
10. Department of Anesthesiology, Chifeng Municipal Hospital, Chifeng, China
11. Department of Anesthesiology, Zhejiang Provincial People’s Hospital, Affiliated People’s Hospital, Hangzhou Medical College, Hangzhou, China
12. Department of Anesthesiology, Second Affiliated Hospital of Anhui Medical University, Hefei, China
13. Department of Anesthesiology, Nanjing First Hospital, Nanjing, China