title: A preliminary survey of drug dependence in the state of Penang, West Malaysia.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D005260:Female; D006801:Humans; D008296:Malaysia; D008297:Male; D008875:Middle Aged; D019966:Substance-Related Disorders / Q000453:epidemiology*