1 Department of Cardiovascular and Thoracic Surgery, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, Ave Hippocrate 10, 1200 Brussels, Belgium.
2 Department of Cardiovascular and Thoracic Surgery, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, Ave Hippocrate 10, 1200 Brussels, Belgium. Electronic address: laurent.dekerchove@uclouvain.be.