About the Authors

Chengwei Zhang

Affiliation School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, Hubei, China

Angela Yunxian Wang

Affiliation Akamai Technologies, inc., Cambridge, Massachusetts, United States of America

Xiaojun Hei

heixj@hust.edu.cn

Affiliation School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, Hubei, China

Competing Interests

The second author of the paper, Angela Yunxian Wang, is now with Akamai Technologies, inc. The work in this paper was done by her before she joined Akamai Technologies. Hence, Akamai Technologies does not alter our adherence to all PLOS ONE policies on sharing data and materials.

Author Contributions

Conceptualization: AYW XH. Formal analysis: AYW CZ. Funding acquisition: XH. Investigation: AYW CZ. Methodology: AYW XH. Validation: CZ. Visualization: XH. Writing – original draft: XH. Writing – review & editing: XH CZ.