title: Involvement in a drug subculture and abstinence following treatment among Puerto Rican narcotic addicts.
mesh_terms: D000328:Adult; D000367:Age Factors; D005006:Ethnicity; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011647:Puerto Rico / Q000208:ethnology; D012075:Remission, Spontaneous; D012923:Social Class; D012931:Social Environment; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000628:therapy*; D014481:United States