1. Department of Spinal Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
2. Department of Orthopaedic Surgery, Zhongshan Hospital, Fudan University, Shanghai, China (mainland)
3. Department of Orthopedic Surgery, Longyao County Hospital, Longyao, Hebei, China (mainland)
4. Hebei Provincial Key Laboratory of Orthopaedic Biomechanics, Shijiazhuang, Hebei, China (mainland)