1. Department of Cardiology and Department of Medical and Health SciencesLinköping University Linköping Sweden
2. Heart CenterPrivathospital Molholm Vejle Denmark
3. Electrophysiology SectionDepartment of Medical and Health Sciences Philadelphia Pennsylvania
4. Department of CardiologySkaraborgs Hospital Skovde Sweden
5. Department of Cardiology, Faculty of Medicine and HealthÖrebro University Örebro Sweden
6. Department of CardiologyLund University Lund Sweden