1. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
2. Department of Biomedical Engineering, Tufts University, Medford, MA 02155, USA.
3. Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02155, USA.
4. Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
5. Center for Computational Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.