title: Smoking and lung cancer: causality, Cornfield   and an early observational meta-analysis.
authors.forename: George Davey
authors.initials: GD
authors.lastname: Smith
mesh_terms: D035843:Biomedical Research / Q000266:history*; D049673:History, 20th Century; D008175:Lung Neoplasms / Q000209:etiology / Q000266:history*; D015201:Meta-Analysis as Topic; D012907:Smoking / Q000009:adverse effects / Q000266:history*