Funding for this research was provided by:
Japan Science and Technology Agency
Received: 24 January 2018
Accepted: 5 April 2018
First Online: 20 April 2018
Ethics approval and consent to participate
: The data collection was provided by the Aiiku Research Institute (previously the Japan Child and Family Research Institute) in the 2013 fiscal year, and this project was part of the Project, “Overview of Temporary Custody and Descriptive Investigation for Entered Children.” The Research Ethics Committee of the Aiiku Research Institute (no. 60) and The Committee of Medical Ethics, Graduate School of Human-Care Science, Tsukuba University (no. 898), approved the study protocol. Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.
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