title: [Problems in the retrospective study of the epidemiology of malignant tumors of the upper respiratory tracts].
mesh_terms: D001330:Electronic Data Processing; D004782:Environmental Health; D006801:Humans; D012142:Respiratory Tract Neoplasms / Q000453:epidemiology*; D012189:Retrospective Studies; D012426:Russia; D012959:Socioeconomic Factors
vernacular_title: Voprosy retrospektivnogo izucheniia épidemiologii zlokachestvennykh opukholeĭ verkhnikh dykhatel'nykh puteĭ