1. National Engineering Laboratory for Modern Silk & Collaborative Innovation Center of Suzhou Nano Science and Technology; College of Textile and Clothing Engineering; Soochow University; Suzhou 215123 P. R. China
2. School of Biology and Basic Medical Sciences; Soochow University; Suzhou 215123 P. R. China
3. National Engineering Laboratory for Modern Silk; College of Textile and Clothing Engineering; Soochow University; Suzhou 215123 P. R. China
4. Department of Orthopedics; The Second Affiliated Hospital of Soochow University; Suzhou 215000 P. R. China
5. Department of Burns and Plastic Surgery; The Third Affiliated Hospital of Nantong University; Wuxi 214041 P. R. China
6. Department of Biomedical Engineering; Tufts University; Medford MA 02155 USA