1. Department of Biomedical Engineering, The Chinese University of Hong Kong, Sha Tin, New Territories 999077, Hong Kong, P.R. China
2. Department of Mechanical and Aerospace Engineering, Tandon School of Engineering, New York University, Brooklyn, New York 11201, United States
3. Department of Orthopaedics and Traumatology, Stem Cells and Regenerative Medicine Laboratory, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, SAR, P.R China
4. School of Biomedical Sciences and Engineering, Guangzhou International Campus, South China University of Technology, Guangzhou 511442, P.R. China
5. National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou 510006, P.R. China
6. Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P.R. China
7. Department of Spine Surgery, Tianjin Hospital, Tianjin University, Tianjin 300211, P.R. China