About the Authors

Xiaowei Zhao
Wenyi Zhang
Xin Xu
Zhiqiang Ma

zhiqiang.ma967@gmail.com (ZQM); minghao.yin197@gmail.com (MHY)

Affiliation College of Computer Science and Information Technology, Northeast Normal University, Changchun, People's Republic of China

Minghao Yin

zhiqiang.ma967@gmail.com (ZQM); minghao.yin197@gmail.com (MHY)

Affiliation College of Computer Science and Information Technology, Northeast Normal University, Changchun, People's Republic of China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Wrote the paper: XWZ. Collected data: WYZ XX. Wrote codes: WYZ XX. Developed the web server: WYZ XX. Participated in the research design: ZQM MHY. Participated in the method assessment: ZQM MHY. Participated in preparation of the manuscript: ZQM MHY. Directed the research: XWZ. Read and approved the final manuscript: XWZ WYZ XX ZQM MHY.