1. Department of Anesthesiology, Beijing Chaoyang Hospital, Capital Medical University , No. 8 Gongtinan Road, Chaoyang District , Beijing , 100020 , China
2. Department of Anesthesiology, The Third Medical Centre, Chinese People’s Liberation Army General Hospital , No. 69 Yongding Road, Haidian District , Beijing , 100000 , China
3. Department of Anesthesiology, Beijing Friendship Hospital, Capital Medical University , No. 95 Yongan Road, Xicheng District , Beijing , 100000 , China
4. Department of Biostatistics, Peking University First Hospital , Beijing , 100034 , China
5. Department of Anesthesiology, Beijing You’An Hospital, Capital Medical University , No. 8 Xitou Road, You’an Menwai, Fengtai District , Beijing , 100069 , China