1. Department of Plastic and Cosmetic Surgery The Second Affiliated Hospital of Soochow University Soochow University Suzhou 215004 P. R. China
2. National Engineering Laboratory for Modern Silk and Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 P. R. China
3. Department of Orthopedics School of Medicine The First Affiliated Hospital of Xiamen University Xiamen University Xiamen 361000 P. R. China
4. Department of Dermatology and Cosmetic Surgery The Affiliated Suzhou Hospital of Nanjing Medical University Suzhou 215002 P. R. China
5. Department of Biomedical Engineering Tufts University Medford MA 02155 USA