title: [Value of endoscopic studies in prevention and early diagnosis of malignant gastrointestinal tumors].
authors.forename: M
authors.initials: M
authors.lastname: Klassen
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D016099:Endoscopy, Gastrointestinal; D005500:Follow-Up Studies; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis* / Q000517:prevention & control*; D006801:Humans; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D012680:Sensitivity and Specificity
vernacular_title: Znachenie éndoskopicheskikh issledovaniĭ v profilaktike i ranneĭ diagnostike zlokachestvennykh opukholeĭ zheludochno-kishechnogo trakta.