1. Photonics Research Institute, Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
2. Center for Smart Health, School of Nursing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
3. Department of Computer Science and Engineering, Chinese University of Hong Kong, Shatin, Hong Kong
4. Centre for Smart Health, School of Nursing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong