1. State Key Laboratory
for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
2. Institute of Physics & Optoelectronics Technology, Baoji University of Arts and Sciences, Baoji 721016, China
3. State Key Laboratory of Military Stomatology, Department
of Periodontology, School of Stomatology, The Fourth Military Medical University, Xi’an 710032, China