title: A question of attribution.
authors.affiliation: Department of Epidemiology & Population Sciences, London School of Hygiene & Tropical Medicine, UK.
authors.forename: J R
authors.initials: JR
authors.lastname: Glynn
mesh_terms: D015982:Bias; D015984:Causality; D002771:Cholera / Q000382:microbiology; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology; D012907:Smoking / Q000009:adverse effects; D014871:Water Microbiology