1. Interdisciplinary Division of Biomedical Engineering; the Hong Kong Polytechnic University; Hung Hom, Kowloon Hong Kong P. R. China
2. Department of Applied Physicsthe; Hong Kong Polytechnic University; Hung Hom, Kowloon Hong Kong P. R. China
3. Institute of Textiles & Clothing; the Hong Kong Polytechnic University; Hung Hom, Kowloon Hong Kong P. R. China