title: The epidemiology of drug abuse: current issues. Non-survey techniques--sub-cultural groups.
mesh_terms: D000293:Adolescent; D004812:Epidemiologic Methods; D005006:Ethnicity; D006801:Humans; D008297:Male; D009519:New York City; D011647:Puerto Rico / Q000208:ethnology; D012494:Sampling Studies; D019966:Substance-Related Disorders / Q000453:epidemiology*