1. Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma and War Injuries PLA, Institute of Orthopedics, Chinese PLA General Hospital, Beijing, P.R. China.
2. Department of Spine Surgery, Peking University People's Hospital, Beijing, P.R. China.
3. Beijing Tsinghua Changgeng Hospital Affiliated to Tsinghua University, Tsinghua University Clinical School, Beijing, P.R. China.
4. Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, P.R. China.