1. Department of Orthopedics, People's Hospital of Pingchang County, Pingchang, Sichuan 636400, China
2. Department of Orthopedics, Longhui People’s Hospital, Shaoyang, Hunan 422200, China
3. Department of Orthopedics, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
4. Department of Orthopedics, The Fifth Affiliated Hospital, Southern Medical University, Guangzhou, Guangdong 510900, China
5. Department of Spine Surgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, China