title: [4th report of the Study Group on Cancer of the Digestive System].
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D004032:Diet; D004067:Digestive System Neoplasms / Q000453:epidemiology* / Q000473:pathology / Q000628:therapy; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico; D008875:Middle Aged; D012737:Sex Factors
vernacular_title: Cuarto informe del Grupo de Estudio sobre Cáncer del Aparato Digestivo.