We recognized 172 journal content articles and reports, all of which drew within the direct views of children for inclusion within our review. We looked at:?i?u này th??ng có hình th?c tình nguy?n. Các t? ch?c phi l?i nhu?n th??ng ???c thành l?p v?i m?c ?ích duy nh?t là gi?i quy?t m?t v?n ?? xã h?i. T? ch?c c?ng ??ng liên quan ??n vi?c t?