title: Reflections on the limitations to epidemiology.
authors: Department of Social Medicine, University of Bristol, Canynge Hall, Whiteladies Road, BS8 2PR, Bristol, UK. Zetkin@bristol.ac.uk
authors: G D
authors: GD
authors: Smith
mesh_terms: D015982:Bias; D015986:Confounding Factors, Epidemiologic; D004812:Epidemiologic Methods; D004813:Epidemiology / Q000592:standards* / Q000639:trends; D004992:Ethics, Medical; D006801:Humans; D019359:Knowledge; D011634:Public Health; D015203:Reproducibility of Results; D018570:Risk Assessment; D012307:Risk Factors