1. Department of Mechanical Engineering, The University of Hong Kong, Hong Kong SAR 999077, China
2. Advanced Biomedical Instrumentation Centre Limited, Hong Kong SAR 999077, China
3. Department of Chemistry, The University of Hong Kong, Hong Kong SAR 999077, China
4. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR 999077, China