1. Department of Gastroenterology and Hepatology University Hospital Zürich Zürich Switzerland
2. Department of Internal Medicine 1 Gastroenterology, Pneumology and Endocrinology University Hospital Erlangen and Friedrich‐Alexander‐University of Erlangen‐Nürnberg Erlangen Germany
3. Department of Internal Medicine 5 Hematology and Oncology University Hospital Erlangen and Friedrich‐Alexander‐University Erlangen‐Nürnberg Erlangen Germany
4. Department of Internal Medicine 4 Nephrology and Hypertension University Hospital Erlangen and Friedrich‐Alexander‐University Erlangen‐Nürnberg Erlangen Germany
5. Department of Transfusion Medicine and Haemostaseology University Hospital Erlangen and Friedrich‐Alexander‐University Erlangen‐Nürnberg Erlangen Germany
6. Institute of Virology University Hospital Erlangen, Friedrich‐Alexander‐University Erlangen‐Nürnberg Erlangen Germany