1. Cardiovascular Research Center; GUIDE, University Medical Center Groningen; Groningen The Netherlands
2. Department of Pediatric Cardiology; Center for Congenital Heart Disease, Beatrix Children's Hospital, University Medical Center Groningen; Rm W4.189, CA41, Hanzeplein 1, 9700 RB Groningen The Netherlands
3. Department of Medical Physiology, Division Heart & Lungs; University Medical Center Utrecht; Utrecht The Netherlands
4. Department of Cardiology, Cardiovascular Research Institute; University of Maastricht; Maastricht The Netherlands