1. Department of Physiology, Radboud Institute for Health Sciences, Radboud University Medical Centre, Nijmegen, the Netherlands
2. Coöperatie Volksgezondheidszorg, Business Intelligence Services, Arnhem, the Netherlands
3. Research Institute for Sports and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom
4. Department of Cardiology, Radboud Institute for Health Sciences, Radboud University Medical Centre, Nijmegen, the Netherlands
5. Division of Cardiology, Hartford Hospital, Hartford, Connecticut