1. Department of Cardiovascular Surgery, Universitäts-Herzzentrum Freiburg Bad Krozingen, Bad Krozingen, Baden Württemberg, Germany
2. Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg, Germany
3. Department of Cardiology, Universitäts-Herzzentrum Freiburg Bad Krozingen, Bad Krozingen, Baden-Württemberg, Germany