title: Letter: Risk ratios.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D009369:Neoplasms / Q000453:epidemiology / Q000401:mortality; D009381:Neoplasms, Radiation-Induced / Q000453:epidemiology*; D012306:Risk; D006113:United Kingdom