About the Authors

Lingling Zhai

zll09240924@hotmail.com

Current address: No.77 Pu He Road, Shenyang North New Area, Department of Maternal and Child Health, School of Public Health, China Medical University, Shenyang, Liaoning Province, P.R. China

Affiliation Department of Maternal and Child Health, School of Public Health, China Medical University, Shenyang, Liaoning Province, China, 110013

Jihong Liu

Affiliation Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina, United States of America 29208

Jian Zhao

Affiliation Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang, Liaoning Province, China, 110016

Junxiu Liu

Affiliation Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina, United States of America 29208

Yinglong Bai

Affiliation Department of Maternal and Child Health, School of Public Health, China Medical University, Shenyang, Liaoning Province, China, 110013

Lihong Jia

Affiliation Department of Maternal and Child Health, School of Public Health, China Medical University, Shenyang, Liaoning Province, China, 110013

Xingjia Yao

Affiliation Department of Maternal and Child Health, School of Public Health, China Medical University, Shenyang, Liaoning Province, China, 110013

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: LJ XY. Performed the experiments: YB LZ. Analyzed the data: JZ Junxiu Liu. Contributed reagents/materials/analysis tools: LZ. Wrote the paper: LZ Jihong Liu.