1. School of Materials Science and Engineering, Dalian University of Technology; Dalian 116024 China
2. School of Automotive Engineering, Dalian University of Technology; Dalian 116024 China
3. Dalian R&D Center for Stem Cell and Tissue Engineering; Dalian University of Technology; Dalian 116024 China
4. Department of Orthopedics; First Affiliated Hospital of Dalian Medical University; Dalian 116011 China