[Solitary ulcer of the sigmoid].

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@article{Lanas1987SolitaryUO, title={[Solitary ulcer of the sigmoid].}, author={Alejandra Lanas and J. L. Fern{\'a}ndez Alonso}, journal={Revista espanola de las enfermedades del aparato digestivo}, year={1987}, volume={72 3}, pages={280-1} }