title: Snags in statistics and questionnaires.
authors.forename: B
authors.initials: B
authors.lastname: Tveit
mesh_terms: D015982:Bias; D003430:Cross-Sectional Studies; D003625:Data Collection; D003627:Data Interpretation, Statistical; D015673:Fatigue Syndrome, Chronic / Q000453:epidemiology*; D006801:Humans; D011795:Surveys and Questionnaires