**Acknowledgements**

This work was supported in part by the National Natural Science Foundation of China (NSFC) under Grant 61701159, in part by the Natural Science Foundation of Anhui Province under Grant 101413246, in part by the Foundation for Oversea Master Project from the Ministry of Education, China, under Grant 2160311028, and in part by the start-up funding from the Hefei University of Technology under Grant 407037164.

## **Author details**

Lulu Wang<sup>1</sup> \*, Hu Peng<sup>1</sup> and Jianhua Ma<sup>2</sup>

\*Address all correspondence to: luluwang2015@hfut.edu.cn

1 School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei, China

2 School of Biomedical Technology, Southern Medical University, Guangzhou, China
