1. Department of Spinal SurgeryThe Affiliated Hospital of Qingdao University Qingdao China
2. Department of Spinal SurgeryShandong Provincial Third Hospital, Cheeloo College of Medicine, Shandong University Jinan China
3. Department of OrthopaedicsThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University Wenzhou China
4. The Sanatorium of Qingdao Qingdao China
5. Department of Spinal SurgeryShandong Provincial Hospital affiliated to Shandong University Jinan China
6. Department of OrthopaedicsNanyang City Center Hospital
7. Department of Spinal SurgeryDe Zhou People's Hospital Dezhou China
8. Department of Spinal SurgeryZhoukou Xiehe Orthopedic Hospital Zhoukou China