1. Cardiovascular Research, Antwerp University, Universiteitsplein 1, Antwerp, Wilrijk 2610, Belgium
2. Department of Cardiology, Antwerp University Hospital, Drie Eikenstraat 655, Antwerp 2650, Belgium
3. Hasselt University, Agoralaan, gebouw D, Diepenbeek 3590, Belgium
4. University of Groningen, University Medical Center Groningen, Hanzeplein 1, P.B. 30.001, Groningen 9700 RB, The Netherlands