1. Department of Biomedical
Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
2. National
Engineering Laboratory for Modern Silk, College of Textile and Clothing
Engineering, Soochow University, Suzhou 215021, People’s Republic of China
3. Department
of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States