title: re: "Problems ascertaining friend controls in a case-control study of lung cancer".
authors.forename: S
authors.initials: S
authors.lastname: Jones
authors.forename: A J
authors.initials: AJ
authors.lastname: Silman
mesh_terms: D016022:Case-Control Studies; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology; D008297:Male; D008722:Methods; D008875:Middle Aged; D012595:Scleroderma, Systemic / Q000453:epidemiology; D006113:United Kingdom / Q000453:epidemiology