1 Department Cardiac Surgery, Ghent University Hospital, Ghent, Belgium. Electronic address: isabelle.claus@uzgent.be.
2 Department Cardiovascular Surgery, John Muir Health, Concord, California.
3 Department of Cardiac Surgery, Charles University in Prague, Faculty of Medicine and University Hospital Hradec Kralove, Hradec Kralove, Czech Republic.
4 Department of Thoracic and Cardiovascular Surgery, Saarland University Medical Center, Homburg/Saar, Germany.