1. Department
of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
2. Laboratory
for Atomistic and Molecular Mechanics (LAMM), Department of Civil
and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
3. Department
of Biomedical Engineering, Boston University, 44 Cummington Street, Boston, Massachusetts 02215, United States