1. Department of Cell Biology School of Basic Medical Sciences Southern Medical University Guangzhou Guangdong Province 510515 China
2. Department of Biomedical Engineering Materials Research Institute The Huck Institutes of the Life Sciences The Pennsylvania State University University Park PA 16802 USA
3. Academy of Orthopedics Provincial Key Laboratory of Bone and Joint Degenerative Diseases The Third Affiliated Hospital of Southern Medical University Guangzhou Guangdong Province 510280 China
4. Department of Neurosurgery College of Medicine The Pennsylvania State University Hershey PA 17033 USA
5. Department of Orthopaedics and Rehabilitation College of Medicine The Pennsylvania State University Hershey PA 17033 USA
6. Department of Mechanical Engineering The Pennsylvania State University University Park PA 16802 USA