About the Authors

Chen Cao

Affiliation The College of Computer Science and Technology, Jilin University, Changchun, Jilin, China

Shutan Xu

Affiliation The College of Computer Science and Technology, Jilin University, Changchun, Jilin, China

Lincong Wang

wlincong@hotmail.com

Affiliation The College of Computer Science and Technology, Jilin University, Changchun, Jilin, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CC LW. Performed the experiments: CC SX LW. Analyzed the data: CC SX. Wrote the paper: LW CC.