1 Department of Cardiovascular Surgery, University Heart Center Freiburg, Bad Krozingen, Germany; Faculty of Medicine, Albert Ludwigs University Freiburg, Freiburg, Germany. Electronic address: martin.czerny@universitaets-herzzentrum.de.
2 Department of Cardiovascular Surgery, University Heart Center Freiburg, Bad Krozingen, Germany; Faculty of Medicine, Albert Ludwigs University Freiburg, Freiburg, Germany.
3 Department of Translational Medical Sciences, University of Campania "L. Vanvitelli," Cardiac Surgery Unit, Monaldi Hospital, Naples, Italy.
4 Department of Thoracic and Cardiovascular Surgery, University Medical Center, Tübingen, Germany.