title: Bias in observational study designs: case-control studies.
authors: Institute for Medical and Biomedical Education, St George's, University of London, London, UK p.sedgwick@sgul.ac.uk.
authors: Philip
authors: P
authors: Sedgwick
mesh_terms: D015982:Bias; D016022:Case-Control Studies; D006801:Humans; D009103:Multiple Sclerosis / Q000453:epidemiology*; D012107:Research Design; D012307:Risk Factors; D013472:Sunlight; D011795:Surveys and Questionnaires; D013648:Tasmania / Q000453:epidemiology; D064887:Observational Studies as Topic