Are there muscular structures which may contribute to closure of the gastroesophageal junction?

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@article{LiebermannMeffert1981AreTM, title={Are there muscular structures which may contribute to closure of the gastroesophageal junction?}, author={Dorothea Liebermann-Meffert and Michael M.G. Heberer and Sara Martinoli and Martin Allg{\"{o}wer}, journal={Scandinavian journal of gastroenterology. Supplement}, year={1981}, volume={67}, pages={123} }