1. Department of Cardiothoracic surgery, Sint Antonius Hospital , Koekoekslaan 1, 3435CM, Nieuwegein , the Netherlands
2. Department of Cardiology, Sint Antonius Hospital , Koekoekslaan 1, 3435CM, Nieuwegein , the Netherlands
3. Department of Cardiothoracic Surgery, Radboud University Medical Center , Geert Grooteplein Zuid 10, 6525 GA, Nijmegen , the Netherlands