Funding sources
This work was supported in part by the Health and Labour Sciences Research Grants on Health Research on Children, Youth and Families (H24-Jisedai-Ippan-004) and Grant-in-Aid for Scientific Research (C) from the Japanese Ministry of Education, Culture, Sports, Science and Technology (No. 26460746). The sponsors have had no involvement in the study design, the collection, analysis, and interpretation of data, the writing of the report, or the decision to submit the paper for publication.