title: [Fundamental errors in observed researches].
authors.affiliation: Medicinsk afd V, Arhus Universitetshospital.
authors.forename: H T
authors.initials: HT
authors.lastname: Sørensen
authors.forename: J
authors.initials: J
authors.lastname: Møller-Petersen
authors.forename: S
authors.initials: S
authors.lastname: Sabroe
authors.forename: H
authors.initials: H
authors.lastname: Vilstrup
mesh_terms: D015982:Bias; D015986:Confounding Factors, Epidemiologic; D015203:Reproducibility of Results; D012106:Research / Q000592:standards*; D012107:Research Design / Q000592:standards*; D015983:Selection Bias
vernacular_title: Principielle fejl i observerende undersøgelser.