1. Department of Orthopedic Surgery, The People's Hospital of Baoan Shenzhen, Shenzhen, Guangdong 518101, P.R. China
2. Department of Orthopedics, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250011, P.R. China
3. Department of Spine Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China