title: The epidemiology of drug abuse. Foreword.
mesh_terms: D004812:Epidemiologic Methods; D006556:Heroin Dependence / Q000453:epidemiology / Q000517:prevention & control; D006801:Humans; D008887:Military Medicine; D019966:Substance-Related Disorders / Q000453:epidemiology*; D014481:United States; D014744:Vietnam