1. Department of Orthopaedics; Sir Run Run Shaw Hospital of Medical College of Zhejiang University; Hangzhou China
2. Second Department of Orthopedics; Jiaxing Hospital of Zhejiang General Corps of Armed Police Forces; Jiaxing China
3. Department of Spine Surgery; Weifang People's Hospital; Weifang China
4. Department of Spine; Lishui Center Hospital; Lishui China
5. Department of Spine; Ningbo Sixth Hospital; Ningbo China
6. Department of Spine; The second Affiliated Hospital of Wenzhou Medical University; Wenzhou China
7. Orthopedics Medical Instruments of Hanwei; Weifang China