1. Department of Spine Surgery, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, P.R. China
2. Chemotherapy Department, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
3. Department of Spine Surgery, Shanghai Changzheng Hospital, The Second Military Medical University, Shanghai 200003, P.R. China
4. Department of Spine Surgery, Nantong Third People's Hospital, Nantong, Jiangsu 226006, P.R. China