Heinrich Heine University Dusseldorf - Clinic of Gastroenterology, Hepatology and Infectious Diseases, Heinrich Heine University Dusseldorf - Institute of Virology, Heinrich Heine University Dusseldorf - Clinic of Gastroenterology, Hepatology and Infectious Diseases, University of Cologne - Institute of Virology, Heinrich Heine University Dusseldorf - Institute of Virology, Heinrich Heine University Dusseldorf - Institute of Medical Microbiology and Hospital Hygiene, Heinrich Heine University Dusseldorf - Clinic of Gastroenterology, Hepatology and Infectious Diseases, Heinrich Heine University Dusseldorf - Clinic of Gastroenterology, Hepatology and Infectious Diseases, Heinrich Heine University Dusseldorf - Clinic of Gastroenterology, Hepatology and Infectious Diseases, Heinrich Heine University Dusseldorf - Clinic of Gastroenterology, Hepatology and Infectious Diseases, Heinrich Heine University Dusseldorf - Clinic of Gastroenterology, Hepatology and Infectious Diseases, University of Cologne - Institute of Virology, Heinrich Heine University Dusseldorf - Institute of Virology, Heinrich Heine University Dusseldorf - Clinic of Gastroenterology, Hepatology and Infectious Diseases, Heinrich Heine University Dusseldorf - Clinic of Gastroenterology, Hepatology and Infectious Diseases and Independent