[4th report of the Study Group on Cancer of the Digestive System].

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@article{Villalobos19824thRO, title={[4th report of the Study Group on Cancer of the Digestive System].}, author={Jos{\'e} D. Villalobos and Mariem P{\'e}rez-Pe{\~n}a Garc{\'i}a and Antonio Campos and Mario Maqueo and E Ciklik}, journal={Gaceta medica de Mexico}, year={1982}, volume={118 10}, pages={419-26} }