title: Uppers and downers.
authors.forename: Stanford T
authors.initials: ST
authors.lastname: Shulman
mesh_terms: D000293:Adolescent; D000328:Adult; D001445:Bahrain; D001938:Brazil; D006801:Humans; D020407:Internet; D010678:Philately; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000517:prevention & control