1. Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
2. Department of Anesthesiology, Shandong Provincial Hospital, Jinan, Shandong 250021, China.
3. Department of Anesthesiology, Children's Hospital of Chongqing Medical University, Chongqing 400016, China.
4. Psychology Department, Thames Valley University, Brentford, Middx TW8 9GA, United Kingdom.