About the Authors

Gang Pan

gpan@zju.edu.cn

Affiliation Department of Computer Science, Zhejiang University, Hangzhou, Zhejiang, China

Wangsheng Zhang

Affiliation Department of Computer Science, Zhejiang University, Hangzhou, Zhejiang, China

Zhaohui Wu

Affiliation Department of Computer Science, Zhejiang University, Hangzhou, Zhejiang, China

Shijian Li

Affiliation Department of Computer Science, Zhejiang University, Hangzhou, Zhejiang, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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