title: Some methodological issues in nutritional epidemiology.
authors.affiliation: University of Cambridge.
authors.forename: N E
authors.initials: NE
authors.lastname: Day
authors.forename: P
authors.initials: P
authors.lastname: Ferrari
mesh_terms: D015982:Bias; D015984:Causality; D004032:Diet; D004034:Diet Surveys; D015340:Epidemiologic Research Design; D004813:Epidemiology; D006801:Humans; D009369:Neoplasms / Q000453:epidemiology* / Q000209:etiology; D009747:Nutritional Physiological Phenomena; D011446:Prospective Studies; D012189:Retrospective Studies