1. Department of Medicine, Unit of Cardiology, Karolinska Institute , K2 Medicin, Solna, K2 Kardio Pernow J, 171 77 Stockholm , Sweden
2. Department of Cardiology, Heart and Vascular Center, Karolinska University Hospital , Norrbacka S1:02, Karolinska Universitetssjukhuset Solna, 17176 Stockholm , Sweden
3. Division of Nursing, Department of Neurobiology, Care Sciences and Society, Karolinska Institute , H1 Neurobiologi, vårdvetenskap och samhälle, H1 Omvårdnad Omv enhet 3, 171 77 Stockholm , Sweden