1 Department of Cardiology, Ziekenhuis Oost-Limburg, Genk, Belgium; Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Diepenbeek, Belgium. Electronic address: wilfried.mullens@zol.be.
2 Department of Cardiology, Ziekenhuis Oost-Limburg, Genk, Belgium; Doctoral School for Medicine and Life Sciences, Hasselt University, Diepenbeek, Belgium.