title: A chain is as strong as its weakest link but that link could be the subject matter of the questionnaire!
authors.forename: Nigel
authors.initials: N
authors.lastname: Stocks
authors.forename: David
authors.initials: D
authors.lastname: Gunnell
mesh_terms: D015982:Bias; D005194:Family Practice; D006302:Health Services Research; D006801:Humans; D011795:Surveys and Questionnaires