1. School of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, P.R. China
2. Department of Biomedical Engineering, National University of Singapore, Singapore 117583, Singapore
3. Department of Electrical and Computer Engineering, Faculty of Engineering, National University of Singapore, Singapore 117583, Singapore
4. Institute for Health Innovation and Technology, National University of Singapore, Singapore 117599, Singapore
5. The N.1 Institute for Health, National University of Singapore, Singapore 117456, Singapore