1. Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong.
2. Oxford-CityU Centre for Cerebro-Cardiovascular Health Engineering (COCHE), Shatin, N.T., Hong Kong.
3. Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3815, United States.
4. Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong.
5. Centre for Perceptual and Interactive Intelligence (CPII), Shatin, N.T., Hong Kong.