About the Authors

Zheng Wang

flair@126.com

Affiliation Institute of Automation, Chinese Academy of Sciences, Beijing, China

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

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