title: ER drug visits resumed upward climb in '91 following dip in 1990.
mesh_terms: D003625:Data Collection; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D006801:Humans; D012637:Security Measures; D019966:Substance-Related Disorders / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology