1. Department of Cardiology; University Medical Center Groningen/University of Groningen; the Netherlands
2. ISV, Department of Social and Welfare Studies; Faculty of Health Sciences; Linköping Sweden
3. Department of Cardiology; University Medical Center Utrecht; Utrecht the Netherlands
4. Julius Center for Health Sciences and Primary Care; University Medical Center Utrecht; the Netherlands
5. Department of Cardiology; Wilhelmina Ziekenhuis Assen; the Netherlands
6. Department of Cardiology; Ziekenhuisgroep Twente; Almelo and Hengelo the Netherlands
7. Department of Cardiology; Stichting Deventer Ziekenhuizen; Deventer the Netherlands
8. Department of General Practice Medicine; University Medical Center Groningen, University of Groningen; the Netherlands