About the Authors

Di Ao

Affiliations School of Engineering, Sun Yat-sen University, Guangzhou, Guang Dong, P. R. China, Key Laboratory of Sensing Technology and Biomedical Instrument of GuangDong province, Guangzhou, Guang Dong, P. R. China

Rong Song

songrong@mail.sysu.edu.cn

Affiliations School of Engineering, Sun Yat-sen University, Guangzhou, Guang Dong, P. R. China, Key Laboratory of Sensing Technology and Biomedical Instrument of GuangDong province, Guangzhou, Guang Dong, P. R. China

Kai-yu Tong

Affiliation Division of Biomedical Engineering, Department of Electronic Engineering, the Chinese University of Hong Kong, Hong Kong, China

Competing Interests

The authors have declared that no competing interests exist

Author Contributions

Conceived and designed the experiments: DA RS KT. Performed the experiments: DA RS. Analyzed the data: DA RS. Contributed reagents/materials/analysis tools: DA. Wrote the paper: DA RS KT.