1. Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg and Sahlgrenska University Hospital, Goteborg, Sweden;
2. Department of Cardiology, Lund University and Skåne University Hospital, Lund, Sweden;
3. Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden;
4. Department of Medical Sciences, Cardiology, Uppsala University, Uppsala, Sweden;
5. Department of Cardiology, Karolinska University Hospital, Stockholm, Sweden