1. University of Groningen, University Medical Center Groningen, Department of Cardiology, Groningen, 9713 GZ, Netherlands
2. Institute for Physiology and Pathophysiology, Johannes Kepler University, Linz 4040, Austria
3. Lindenhofhospital, Department of Nephrology, Bern 3011, Switzerland
4. Nierenpraxis Bern, Bern 3011, Switzerland
5. University of Groningen, University Medical Center Groningen, Department of Pathology and Medical Biology, Groningen, 9713 GZ, Netherlands
6. Department of Cardiology, University Medical Center Utrecht, Utrecht, 3584 CX, Netherlands