Affiliation: | a Department of Nephrology, University Hospital Essen, University Duisburg-Essen, Essen, Germany b Department of Thoracic and Cardiovascular Surgery, University Hospital Essen, University Duisburg-Essen, Essen, Germany c Department of Medicine, Rotes Kreuz Krankenhaus, St. Pauli Deich 24, 28199Bremen, Germany |