Wilhelm Röll, University of Bonn (IMAGE) University of Bonn Caption This is Wilhelm Röll from the Department of Cardiac Surgery of the University Hospital Bonn. Credit © Photo: UKB Usage Restrictions This photo may be used with the press release. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.