1. Department of Medical Science and Cardiology, Uppsala University, Uppsala, Sweden
2. Department of Molecular and Clinical Medicine/Cardiology, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Sweden
3. Department of Cardiology, Sahlgrenska University Hospital, Gothenburg, Sweden
4. Heart and Vascular Theme, Karolinska University Hospital, Stockholm, Sweden
5. Heart Centre and Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
6. Tampere University Hospital, Heart Center, Department of Cardiology, Tampere, Finland