1 Department of Orthopaedics, Qilu Hospital of Shandong University, Shandong University Centre for Orthopaedics, Advanced Medical Research Institute, Cheeloo College of Medicine, Shandong University, Jinan, China.
2 School of Physics and Mechanical and Electrical Engineering, Longyan University, Longyan, China.
3 The Second Hospital of Shandong University, Cheeloo College of Medicine, Shandong University, Jinan, China.
4 Faculty of Medicine and Health, The Back Pain Research Team, Sydney Musculoskeletal Health, The Kolling Institute, University of Sydney, Sydney, Australia.