1. Cardiology Unit, Department of Medicine, Karolinska Institute; Karolinska University Hospital Solna, N3:06; SE-171 76 Stockholm Sweden
2. Division of Cardiovascular Medicine, Department of Medicine and Health Sciences; Linköping University; Linköping Sweden
3. Department of Cardiology UHL; County Council of Östergötland; Linköping Sweden
4. Centre for Safety Research; KTH Royal Institute of Technology; Stockholm Sweden