About the Authors

Jiming Chen

Contributed equally to this work with: Jiming Chen, Yingxue Sun

jmchen66@yahoo.cn

Affiliation China Animal Health and Epidemiology Center, Qingdao, China

Yingxue Sun

Contributed equally to this work with: Jiming Chen, Yingxue Sun

Affiliation China Animal Health and Epidemiology Center, Qingdao, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JC. Performed the experiments: YS JC. Analyzed the data: JC YS. Contributed reagents/materials/analysis tools: YS JC. Wrote the paper: JC YS.