Pieter Martens1,2, Matthias Dupont1, Wilfried Mullens1,3. 1. Department of Cardiology, Ziekenhuis Oost-Limburg, Genk, Belgium. 2. Doctoral School for Medicine and Life Sciences, Hasselt University, Diepenbeek, Belgium. 3. Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Diepenbeek, Belgium.