About the Authors

Long Ma

Affiliation School of Systems Science, Beijing Normal University, Beijing, 100875, P.R. China

Xiao Han

Affiliation School of Systems Science, Beijing Normal University, Beijing, 100875, P.R. China

Zhesi Shen

Affiliation School of Systems Science, Beijing Normal University, Beijing, 100875, P.R. China

Wen-Xu Wang

wenxuwang@bnu.edu.cn (WXW); zdi@bnu.edu.cn (ZD)

Affiliation School of Systems Science, Beijing Normal University, Beijing, 100875, P.R. China

Zengru Di

wenxuwang@bnu.edu.cn (WXW); zdi@bnu.edu.cn (ZD)

Affiliation School of Systems Science, Beijing Normal University, Beijing, 100875, P.R. China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WXW ZD. Performed the experiments: LM XH ZS. Analyzed the data: LM XH ZS WXW. Contributed reagents/materials/analysis tools: ZS WXW. Wrote the paper: WXW ZD.