1. Institute of Virology; University Hospital of Essen, University of Duisburg-Essen; Essen Germany
2. Department of Gastroenterology and Hepatology; University Hospital of Essen; Essen Germany
3. Department of Gastroenterology and Hepatology; University Hospital of Magdeburg; Magdeburg Germany
4. Department of Molecular and Medical Virology; Ruhr University; Bochum Germany
5. Institute of Virology; University Hospital of Düsseldorf, University of Düsseldorf; Düsseldorf Germany