About the Authors

Bo Xi

Affiliation Department of Maternal and Child Health, School of Public Health, Shandong University, Jinan, China

Shuangshuang Li

Affiliation Department of Maternal and Child Health, School of Public Health, Shandong University, Jinan, China

Zhaolu Liu

Affiliation Department of Maternal and Child Health, School of Public Health, Shandong University, Jinan, China

Huan Tian

Affiliation Department of Maternal and Child Health, School of Public Health, Shandong University, Jinan, China

Xiuxiu Yin

Affiliation Department of Maternal and Child Health, School of Public Health, Shandong University, Jinan, China

Pengcheng Huai

Affiliation Department of Epidemiology and Health Statistics, School of Public Health, Shandong University, Jinan, China

Weihong Tang

Affiliation Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, United States of America

Donghao Zhou

donghaozhou@163.com (DZ); steffen@umn.edu (LMS)

Affiliation Department of Endocrinology, Linyi People's Hospital, Linyi, China

Lyn M. Steffen

donghaozhou@163.com (DZ); steffen@umn.edu (LMS)

Affiliation Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: BX DZ LMS. Analyzed the data: BX SL. Contributed reagents/materials/analysis tools: HT XY WT ZL. Wrote the paper: BX. Acquired the data: XY PH. Reviewed and approved the manuscript: BX SL PH DZ LMS HT XY WT ZL.