Street children and substance abuse.
D000293:Adolescent; D000437:Alcoholism / Q000453:epidemiology* / Q000517:prevention & control; D002648:Child; D003431:Cross-Cultural Comparison; D003906:Developing Countries; D005260:Female; D006703:Ill-Housed Persons / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D012307:Risk Factors; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000517:prevention & control; D014505:Urban Population / Q000706:statistics & numerical data*; D014944:World Health Organization