1. Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States
2. Silklab, Department of Biomedical Engineering, Tufts University, 200 Boston Avenue, Suite 4875, Medford, Massachusetts 02155, United States
3. Department of Electrical and Computer Engineering, Tufts University, Medford, Massachusetts 02155, United States
4. Department of Physics, Tufts University, Medford, Massachusetts 02155, United States