1. Department of Biomedical Engineering, City University of Hong Kong, Hong Kong, China
2. Hong Kong Center for Cerebra-Cardiovascular Health Engineering, Hong Kong Science Park, New Territories 999077, Hong Kong, China
3. College of Professional and Continuing Education, The Hong Kong Polytechnic University, Hong Kong SAR, China
4. Department of Materials Science and Engineering, Centre for Functional Photonics, and Hong Kong Branch of National Precious Metals Material Engineering Research Centre, City University of Hong Kong, Hong Kong, China