About the Authors

Zhiming Dai, Xianhua Dai
School of Information Science and Technology, Sun Yat-Sen University, Guangzhou, China

Corresponding Authors

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ZD. Performed the experiments: ZD. Analyzed the data: ZD XD. Contributed reagents/materials/analysis tools: ZD. Wrote the paper: ZD.