1. Division of Gastroenterology and Hepatology University Hospital of Zurich Zurich Switzerland
2. Division of Clinical Pharmacology and Toxicology University of Zurich Zurich Switzerland
3. Swiss Pediatric Liver Center University Hospitals Geneva Geneva Switzerland
4. Diagnostic Department, Division of Clinical Pathology University Hospitals Geneva Geneva Switzerland
5. Department of Gastroenterology, Hepatology, and Infectious Diseases, Medical Faculty Heinrich Heine University Düsseldorf Düsseldorf Germany