1. Department of Physiology, VU University Medical Center, Van der Boechorststraat 7, 1081 BT, Amsterdam, The Netherlands
2. Experimental Cardiology Laboratory, Department of Cardiology, Division of Heart and Lungs, University Medical Center Utrecht, P.O. Box 85500, 3508 GA, Utrecht, The Netherlands
3. ICIN, Netherlands Heart Institute, Catharijnesingel 52, 3511 GC Utrecht, The Netherlands