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Affiliation(s)
- Guido Gerken
- Department of Gastroenterology and Hepatology, Faculty of Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Andreas Paul
- Department of General, Visceral and Transplantation Surgery, Faculty of Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
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