About the Authors

Hiroko Hirai

Roles Conceptualization, Investigation, Writing – original draft

Affiliation Faculty of Medicine, Department of Pediatrics, University of Toyama, Toyama, Japan

Tomomi Tanaka

Roles Writing – review & editing

tharai@med.u-toyama.ac.jp

Affiliations Faculty of Medicine, Department of Pediatrics, University of Toyama, Toyama, Japan, Toyama Regional Center for JECS, University of Toyama, Toyama, Japan

Kenta Matsumura

Roles Data curation, Formal analysis, Writing – review & editing

Affiliation Toyama Regional Center for JECS, University of Toyama, Toyama, Japan

Akiko Tsuchida

Roles Writing – review & editing

Affiliations Toyama Regional Center for JECS, University of Toyama, Toyama, Japan, Faculty of Medicine, Department of Public Health, University of Toyama, Toyama, Japan

Kei Hamazaki

Roles Writing – review & editing

Current address: Department of Public Health, Graduate School of Medicine, Gunma University, Maebashi, Gunma, Japan

Affiliations Toyama Regional Center for JECS, University of Toyama, Toyama, Japan, Faculty of Medicine, Department of Public Health, University of Toyama, Toyama, Japan

Yuichi Adachi

Roles Writing – review & editing

Affiliation Pediatric Allergy Center, Toyama Red Cross Hospital, Toyama, Japan

Hidekuni Inadera

Roles Writing – review & editing

Affiliations Toyama Regional Center for JECS, University of Toyama, Toyama, Japan, Faculty of Medicine, Department of Public Health, University of Toyama, Toyama, Japan

the Japan Environment and Children’s Study Group

The names of the study group members are provided at the end of the manuscript

Competing Interests

The authors have declared that no competing interests exist.