[1] Huazhong Univ Sci & Technol, Tongji Hosp, Tongji Med Coll, Dept Anesthesiol & Pain Med, Wuhan 430030, Hubei, Peoples R China
[2] Univ Hong Kong, Queen Mary Hosp, Dept Anaesthesiol, Hong Kong, Hong Kong, Peoples R China
[3] Huazhong Univ Sci & Technol, Tongji Med Coll, Wuhan Puai Hosp, Dept Pain Management, Wuhan 430034, Peoples R China
[4] Univ Hong Kong, Queen Mary Hosp, Dept Anaesthesiol, Hong Kong, Hong Kong, Peoples R China