About the Authors

Takashi X. Fujisawa

Contributed equally to this work with: Takashi X. Fujisawa, Chiho Yatsuga

Affiliations Research Center for Child Mental Development, University of Fukui, Fukui, Japan, Department of Child Development, United Graduate School of Child Development, Osaka University, Kanazawa University, Hamamatsu University School of Medicine, Chiba University and University of Fukui, Fukui, Japan

Chiho Yatsuga

Contributed equally to this work with: Takashi X. Fujisawa, Chiho Yatsuga

Affiliations Research Center for Child Mental Development, University of Fukui, Fukui, Japan, Department of Child Development, United Graduate School of Child Development, Osaka University, Kanazawa University, Hamamatsu University School of Medicine, Chiba University and University of Fukui, Fukui, Japan

Hiroyo Mabe

Affiliation Department of Child Development, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan

Eiji Yamada

Affiliation Department of Child Development, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan

Masato Masuda

Affiliation Department of Child Development, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan

Akemi Tomoda

atomoda@u-fukui.ac.jp

Affiliations Research Center for Child Mental Development, University of Fukui, Fukui, Japan, Department of Child Development, United Graduate School of Child Development, Osaka University, Kanazawa University, Hamamatsu University School of Medicine, Chiba University and University of Fukui, Fukui, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AT. Performed the experiments: HM EY MM AT. Analyzed the data: TXF CY. Contributed reagents/materials/analysis tools: AT. Wrote the paper: TXF CY AT.