1. Department of Internal Medicine I, University Hospital Bonn, Bonn, Germany
2. Center for Cirrhosis and Portal Hypertension Bonn (CCB), University Hospital Bonn, Bonn, Germany
3. Department of Internal Medicine B, Münster University Hospital, Münster, Germany
4. Department of Visceral Surgery, University Hospital Bonn, Bonn, Germany
5. Department of Ophthalmology, University Hospital Bonn, Bonn, Germany