1. Department of Clinical Sciences, Karolinska Institutet, Danderyd University Hospital, Stockholm, Sweden
2. Department of Internal Medicine, Danderyd University Hospital, Stockholm, Sweden
3. Department of Cardiology, Danderyd University Hospital, Stockholm, Sweden
4. Cardiology Unit, Department of Medicine K2, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
5. Department of Clinical Physiology, Capio St Görans Hospital, Stockholm, Sweden