About the Authors

Fen Yang

Affiliation Guangdong Provincial Center for Disease Control and Prevention, Guangzhou City, Guangdong Province, People’s Republic of China

Jianfeng He

hjf@vip.sina.com

Affiliation Guangdong Provincial Center for Disease Control and Prevention, Guangzhou City, Guangdong Province, People’s Republic of China

Haojie Zhong

Affiliation Guangdong Provincial Center for Disease Control and Prevention, Guangzhou City, Guangdong Province, People’s Republic of China

Changwen Ke

Affiliation Guangdong Provincial Center for Disease Control and Prevention, Guangzhou City, Guangdong Province, People’s Republic of China

Xin Zhang

Affiliation Guangdong Provincial Center for Disease Control and Prevention, Guangzhou City, Guangdong Province, People’s Republic of China

Teng Hong

Affiliation Guangdong Provincial Center for Disease Control and Prevention, Guangzhou City, Guangdong Province, People’s Republic of China

Hanzhong Ni

Affiliation Guangdong Provincial Center for Disease Control and Prevention, Guangzhou City, Guangdong Province, People’s Republic of China

Jinyan Lin

Affiliation Guangdong Provincial Center for Disease Control and Prevention, Guangzhou City, Guangdong Province, People’s Republic of China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: FY JFH HJZ JYL. Performed the experiments: CWK XZ HZN. Analyzed the data: FY TH. Contributed reagents/materials/analysis tools: FY JFH CWK XZ HZN. Wrote the paper: FY JFH XZ.