title: [1st report of the Study Group on Cancer of the Digestive Tract. Introduction].
mesh_terms: D004067:Digestive System Neoplasms / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico; D012042:Registries
vernacular_title: Primer informe del grupo de estudio del cáncer del aparato digestivo. I. Introduction.