1. Ministry of Health, Labour and Welfare. Vital statistics of population 2018. Available from: https://www.mhlw.go.jp/toukei/saikin/hw/jinkou/suikei18/dl/2018suikei.pdf.
2. Ministry of Health, Labour and Welfare. The number of consultation about child abuse in child consultation centers 2018. Available from: https://www.mhlw.go.jp/content/11901000/000348313.pdf.
3. Parental bonding in severely suicidal adolescent inpatients;O Freudenstein;European Psychiatry,2011
4. Child maltreatment and repeat presentations to the emergency department for suicide-related behaviors;AE Rhodes;Child abuse & neglect,2013
5. Clarifying the relationship of parental bonding to suicide ideation and attempts;BY Saffer;Suicide and Life‐Threatening Behavior,2015