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Univ Duisburg Essen, Univ Hosp Essen, Dept Gastroenterol Hepatol & Transplant Med, Hufelandstr 55, D-45147 Essen, Germany
Helios Hosp, Gastroenterol Hepatol & Palliat Med, Robert Koch Str 2, D-42549 Velbert, Germany Univ Duisburg Essen, Univ Hosp Essen, Dept Gastroenterol Hepatol & Transplant Med, Hufelandstr 55, D-45147 Essen, Germany