1. Department of Biomedical Engineering Tufts University Medford MA 02155 USA
2. Silk lab Tufts University Medford MA 02155 USA
3. School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China
4. Department of Physics and Astronomy Tufts University Medford MA 02155 USA
5. Department of Molecular Medicine University of Pavia Pavia 27100 Italy
6. Department of Electrical Engineering Tufts University Medford MA 02155 USA