1. Department of Orthopaedic Surgery, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
2. Public Laboratory Technology Center, West China Hospital, Sichuan University, Chengdu, Sichuan 637000, P.R. China
3. Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China