1. National Engineering Laboratory for Modern Silk; College of Textile and Clothing Engineering; Soochow University; Suzhou 215123 China
2. Institute of Textiles and Clothing; The Hong Kong Polytechnic University; Hong Kong China
3. Department of Applied Biology and Chemical Technology; The Hong Kong Polytechnic University; Hong Kong China
4. Department of Biomedical Engineering; Tufts University; 4 Colby St, Room 153 Medford MA 02155 USA