1. Departments of Anatomy; University of South China; Hengyang City Hunan Province 421001 PRC
2. Spinal Surgery Department; The 169th hospital of P.L.A; Hengyang City Hunan Province 421001 PRC
3. Radiology Department; The 169th hospital of P.L.A; Hengyang City Hunan Province 421001 PRC
4. Spinal Surgery Department; The second affiliated hospital of university of south china; Hengyang City Hunan Province 421001 PRC