1. Department of Cardiology; Karolinska University Hospital, Huddinge, Institution of Medicine (H7), Huddinge; Karolinska Institutet; 141 86 Stockholm Sweden
2. Department of Cardiology and Department of Medical and Health Sciences; Linköping University Hospital; Linköping Sweden
3. Department of Clinical Sciences; Danderyd University Hospital, Karolinska Institutet; Stockholm Sweden
4. Department of Medicine, Section of Cardiology, Solna, Karolinska Institutet; Karolinska University Hospital; Stockholm Sweden