1. Department of Medicine Karolinska Institutet Stockholm Sweden
2. Department of Clinical Sciences, Lund University Lund Cardiothoracic Surgery, and Medicine Services University Trust, Region Skåne Lund Sweden
3. Heart Centre Cardiology, Umeå University Hospital Umeå Sweden
4. Department of Clinical Sciences Lund, Clinical Physiology and Skåne University Hospital Lund University Lund Sweden
5. Cardiology Unit, Department of Medicine Karolinska Institutet Stockholm Sweden