1. Department of Pathology, Tianjin Union Medical Center, Tianjin, China
2. Tianjin Medical University, Tianjin, China
3. Department of Spine Center, Tianjin Union Medical Center, Tianjin, China
4. Graduate School, Tianjin University of Traditional Chinese Medicine, Tianjin, China
5. Nankai University School of Medicine, Nankai University, Tianjin, China