1. Department of Nephrology, University Hospital Essen University Duisburg‐Essen Duisburg Germany
2. Institute for Virology, University Hospital Essen University Duisburg‐Essen Duisburg Germany
3. Department of Infectious Diseases, University Hospital Essen University Duisburg‐Essen Duisburg Germany
4. Institute for Clinical Microbiology and Hygiene, National Consultant Laboratory for HAV and HEV University Hospital Regensburg Regensburg Germany