[Eighth report from the Study Group on Cancer of the Digestive Tract].
D000368:Aged; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008800:Mexico; D008875:Middle Aged
Octavo informe del grupo de estudios sobre cáncer del aparato digestivo.