1. Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, Pennsylvania 18015, USA
2. Department of Bioengineering, Lehigh University, Bethlehem, Pennsylvania 18015, USA
3. Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania 18015, USA
4. Department of Material Science and Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, USA