title: An apology from Frischer et al.
authors.forename: M
authors.initials: M
authors.lastname: Frischer
authors.forename: D
authors.initials: D
authors.lastname: Goldberg
authors.forename: M
authors.initials: M
authors.lastname: Bloor
authors.forename: S
authors.initials: S
authors.lastname: Green
authors.forename: N
authors.initials: N
authors.lastname: McKeganey
mesh_terms: D003430:Cross-Sectional Studies; D006801:Humans; D015994:Incidence; D011643:Publishing / Q000592:standards*; D012606:Scotland / Q000453:epidemiology; D015819:Substance Abuse, Intravenous / Q000453:epidemiology*; D014505:Urban Population / Q000706:statistics & numerical data*