1. College of Materials Science and Engineering, Zhejiang University of Technology, Zhejiang 310014, P. R. China
2. Department of Stomatology Surgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Zhejiang 322000, P. R. China
3. Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Zhejiang 310003, P. R. China
4. The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States