1. School of Physical Education, Southwest Medical University, Luzhou, China
2. Department of Spinal Surgery, The Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Sichuan, China
3. Geriatric department, The Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Sichuan, China
4. Division of Spine Surgery, Department of Orthopedic Surgery, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University