1. The Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and Technology Xi'an Jiaotong University Xi'an 710049 P. R. China
2. Bioinspired Engineering & Biomechanics Center (BEBC) Xi'an Jiaotong University Xi'an 710049 P. R. China
3. State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China
4. MOE Key Laboratory for Multifunctional Materials and Structures Xi'an Jiaotong University Xi'an 710049 P. R. China
5. Department of Mechanical Engineering & Materials Science Washington University in St. Louis St. Louis MO 63130 USA
6. NSF Science and Technology Center for Engineering Mechanobiology Washington University in St. Louis St. Louis MO 63130 USA