title: [Survey on the use of drugs, 4th sample].
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico; D012494:Sampling Studies; D019966:Substance-Related Disorders / Q000453:epidemiology*
vernacular_title: Investigación sobre el uso de sustancias intoxicantes, cuarta muestra.