1. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, Xi’ an, Shaanxi, PR China.
2. Department of Biological Structure, School of Medicine, University of Washington, Seattle, WA, USA.
3. Department of Applied Physics, Xi'an Jiaotong University, Xi’an, Shaanxi, PR China.
4. Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, Shaanxi, PR China.
5. Department of Materials Science & Engineering, University of Washington, Seattle, WA, USA.
6. Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, Bologna, Italy.
7. College of Dental Medicine, Augusta University, Augusta, GA, USA.