1. Division of Gastroenterology and Hepatology; University Hospital Zürich; Zürich Switzerland
2. Swiss HPB Center; University Hospital Zürich; Zürich Switzerland
3. Division of Gastroenterology and Hepatology; Hospital St. Gallen; St. Gallen Switzerland
4. Epatocentro Ticino; Lugano Switzerland
5. Division of Infectious Diseases; University Hospital Zürich; Zürich Switzerland
6. Institute of Medical Virology; University of Zurich; Zurich Switzerland
7. Division of Biostatistics; Institute of Social and Preventive Medicine Zürich; University of Zürich; Zürich Switzerland