1. Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
2. College of Engineering, University of Arizona, Tucson, AZ 85721, USA
3. State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, China
4. Department of Biomedical Materials and Engineering, Graduate School of Dental Medicine, Hokkaido University, Sapporo 060-8586, Japan