1. Department of Spinal Surgery The Affiliated Hospital of Qingdao University Qingdao China
2. Department of Pain YanTai YuHuangDing Hospital Yantai China
3. Department of Orthopedic The Gaomi People's Hospital Gaomi China
4. Department of Orthopedic The Feicheng People's Hospital Feicheng China
5. Department of Orthopedic The Eighth People's Hospital of Qingdao Qingdao China