About the Authors

Takeo Fujiwara

fujiwara-tk@ncchd.go.jp

Affiliation Department of Social Medicine, National Research Institute for Child Health and Development, Tokyo, Japan

Laura D. Kubzansky

Affiliation Department of Society, Human Development, and Health, Harvard School of Public Health, Massachusetts, United States of America

Kenji Matsumoto

Affiliation Department of Allergy and Immunology, National Research Institute for Child Health and Development, Tokyo, Japan

Ichiro Kawachi

Affiliation Department of Society, Human Development, and Health, Harvard School of Public Health, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TF. Performed the experiments: TF. Analyzed the data: TF. Contributed reagents/materials/analysis tools: TF LDK KM IK. Wrote the paper: TF LDK KM IK.