1. Oregon Health and Science University, School of Medicine, 3181 S.W. Sam Jackson Park Road, Portland, Oregon 97239, United States
2. Beijing Information Science and Technology University, Beijing Engineering Research Center of Optoelectronic Information and Instrument, Beijing Key Laboratory of Optoelectronic Measurement Technology, Beijing 100192, China
3. University of Hong Kong, Department of Electrical and Electronic Engineering, Pokfulam Road, Hong Kong, China
4. Chinese University of Hong Kong, Department of Electronic Engineering, Shatin, N.T., Hong Kong, China