1. Department of Pulmonology, Amsterdam Cardiovascular Sciences, VU University Medical Center Amsterdam, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands;
2. Division of Cardiology, Department of Medicine, Medical University of South Carolina, Charleston, SC, USA;
3. Department of Cardiology;
4. Department of Physiology, Amsterdam Cardiovascular Sciences, VU University Medical Center Amsterdam, Amsterdam, The Netherlands