1. Department of Anesthesiology, Renmin Hospital of Wuhan University, 99 Zi Yang Road, Wuhan, Hubei 430060, China
2. Department of Anesthesiology, The First Affiliated Hospital of University of South China, 69 Chuan Shan Road, Hengyang, Hunan 421001, China
3. Department of Cardiac Surgery, Chongqing Zhongshan Hospital, 312 Zhongshan Road, Chongqing 400013, China
4. Department of Anesthesiology, The University of Hong Kong, Hong Kong
5. Department of Anesthesiology, Affiliated Hospital of Guangdong Medical College, Zhanjiang, Guangdong 524001, China