1. Center of Experimental Medicine, Institute of Biochemistry and Molecular Biology II: Molecular Cell Biology, University Hospital Hamburg-Eppendorf, D-20246 Hamburg, Germany.
2. Center of Radiology, Clinic and Polyclinic of Diagnostic Radiology and Interventional Radiology, University Hospital Hamburg-Eppendorf, D-20246 Hamburg, Germany.
3. Center of Transplantation, Department of Hepatobiliary Surgery and Visceral Transplantation, University Hospital Hamburg-Eppendorf, D-20246 Hamburg, Germany.
4. Center of Internal Medicine, Medical Clinic and Polyclinic I, University Hospital Hamburg-Eppendorf, D-20246 Hamburg, Germany.
5. Current address: Medical Clinic II, Evangelisches Krankenhaus Lutherhaus, Essen, Germany.