1. Department of Obstetrics, University Hospital of Zurich, Frauenklinikstrasse 10, 8091 Zurich, Switzerland
2. Department of Surgery and Transplantation, University Hospital of Zurich, Frauenklinikstrasse 10, 8091 Zurich, Switzerland
3. Department of Gastroenterology and Hepatology, University Hospital of Zurich and Swiss HPB Center, Switzerland