Gastroenterology: Official publication of the American Gastroenterological Association. Elsevier.
Chicago-Zitierstil (17. Ausg.)Gastroenterology: Official Publication of the American Gastroenterological Association. Philadelphia, Pa.: Elsevier.
MLA-Zitierstil (8. Ausg.)Gastroenterology: Official Publication of the American Gastroenterological Association. Elsevier.
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