About the Authors

Le Luo

Affiliation Faculty of Computer and Information Science, Southwest University, Chongqing, China

Li Li

lily@swu.edu.cn

Affiliation Faculty of Computer and Information Science, Southwest University, Chongqing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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