1. National Engineering Laboratory for Modern Silk; College of Textile and Clothing Engineering; Soochow University; Suzhou 215123 P. R. China
2. Department of Colorectal Surgery; The Sixth Affiliated Hospital of Sun Yat-Sen University; Guangzhou 510655 China
3. Department of Medical Oncology; Shuguang Hospital; Shanghai University of Traditional Chinese Medicine; Shanghai 201203 China
4. Department of Biomedical Engineering; Tufts University; 4 Colby St Medford MA 02155 USA
5. School of Materials; The University of Manchester; Manchester M13 9PL UK