1. Department of Nursing; The Sahlgrenska Academy at Göteborg University; Box 457, SE 405 30 Göteborg Sweden
2. Department of Cardiology; University of Hull; Kingston upon Hull UK
3. Department of Cardiology; Sahlgrenska University hospital/Sahlgrenska; Göteborg Sweden
4. Department of Medicine; Sahlgrenska University hospital/Östra; Göteborg Sweden