1. Department of Spine and Joint Surgery, The Third People’s Hospital of Jinan, Jinan, Shandong, People’s Republic of China
2. Department of Orthopaedics, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, P.R. China
3. Engineering Technology Research Center for Sports Assistive Devices of Guangdong, Guangzhou Sport University, Guangzhou, China