title: Substance use among street children and other children and youth in especially difficult circumstances.
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D017677:Age Distribution; D002648:Child; D002675:Child, Preschool; D005260:Female; D018453:Homeless Youth / Q000706:statistics & numerical data*; D006801:Humans; D015994:Incidence; D008297:Male; D012307:Risk Factors; D012309:Risk-Taking; D017678:Sex Distribution; D012940:Social Problems / Q000706:statistics & numerical data; D012959:Socioeconomic Factors; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000517:prevention & control; D014944:World Health Organization