About the Authors

Yanjun Zhao

Affiliation MOE-Shanghai Key Laboratory of Children’s Environmental Health, Xinhua Hospital,Shanghai Jiao Tong University School of Medicine, Shanghai, China

Jun Zhang

junjimzhang@gmail.com

Affiliation MOE-Shanghai Key Laboratory of Children’s Environmental Health, Xinhua Hospital,Shanghai Jiao Tong University School of Medicine, Shanghai, China

Chantal Hukkelhoven

Affiliation The Netherlands Perinatal Registry, Utrecht, the Netherlands

Pien Offerhaus

Affiliation AVM (Academy for Midwifery Maastricht), Maastricht, the Netherlands

Joost Zwart

Affiliation Department of Obstetrics and Gynaecology, Deventer Ziekenhuis, Deventer, the Netherlands

Ank de Jonge

Affiliation Midwifery Science, AVAG/EMGO, VU University Medical Centre, Amsterdam, the Netherlands

Caroline Geerts

Affiliation Midwifery Science, AVAG/EMGO, VU University Medical Centre, Amsterdam, the Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JZh AdJ CH CG. Analyzed the data: YJZ CG. Contributed reagents/materials/analysis tools: YJZ JZh CH PO JZw AdJ CG. Wrote the paper: YJZ.