1. Department of Cardiothoracic Surgery, Jessa Hospital , Stadsomvaart 11, 3500 Hasselt, Belgium
2. UHasselt - Hasselt University , Faculty of Medicine and Life Sciences - LCRC, Agoralaan, 3590 Diepenbeek, Belgium
3. Department of Cardiothoracic Surgery, Heart and Vascular Centre, Maastricht University Medical Centre , P. Debyelaan 25, 6229 HX Maastricht, The Netherlands