About the Authors

Hongpeng Sun

Affiliation Department of Child Health, School of Public Health, Soochow University, Suzhou, China

Yana Ma

Affiliation Department of Child Health, School of Public Health, Soochow University, Suzhou, China

Di Han

Affiliation Department of Child Health, School of Public Health, Soochow University, Suzhou, China

Chen-Wei Pan

Affiliation Department of Child Health, School of Public Health, Soochow University, Suzhou, China

Yong Xu

xuyong59@sina.com

Affiliation Department of Child Health, School of Public Health, Soochow University, Suzhou, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HS YX. Analyzed the data: HS. Contributed reagents/materials/analysis tools: YM DH. Wrote the paper: CP HS YM. Revised the article: CP HS YX.