1. Department of Cardiovascular Surgery, Albert-Ludwigs-Universität Freiburg, Freiburg im Breisgau, Germany
2. Department of Diagnostic and Interventional Radiology, Medical Center, Faculty of Medicine, University of Freiburg, Albert-Ludwigs-Universität Freiburg, Freiburg im Breisgau, Germany
3. Department of Cardiac Surgery, Cardiovascular Center, Inselspital Universitatsspital Bern, Bern, Switzerland