About the Authors

Yingying Su

Affiliation National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China

Fujie Zhang

Affiliation National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China

Huixin Liu

Affiliation National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China

M. Kumi Smith

Affiliation Department of Epidemiology, University of North Carolina, Chapel Hill, North Carolina, United States of America

Lin Zhu

Affiliation National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China

Jing Wu

Affiliation National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China

Ning Wang

wangnbj@163.com

Affiliation National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YYS NW. Performed the experiments: YYS HXL LZ MKS. Analyzed the data: YYS. Contributed reagents/materials/analysis tools: FJZ MKS LZ JW. Wrote the paper: YYS FJZ HXL MKS LZ JW NW.