1. Department of Joint and Sports Medicine, The Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, China
2. Department of Pathology, The Second People's Hospital Of Jining, Jining, Shandong 272049, China
3. Department of Spine, The Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, China.
4. Key Laboratory for Experimental Teratology of the Ministry of Education, Department of Cell Biology, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China