1. Cardiology Department; Royal Brompton Hospital; Sydney St. London SW3 6NP UK
2. British Heart Foundation; London UK
3. Castle Hill Hospital, Cottingham; Hull UK
4. The Sahlgrenska Academy at Goteborg University; Goteborg Sweden
5. Division of Cardiology; Golnik Slovenia
6. Linkoping University Hospital; Linkoping Sweden
7. St Vincent's University Hospital; Dublin Ireland
8. Division of Nursing Science, Department of Medicine and Health Sciences; Linköping University; Linköping Sweden
9. University Medical Center; Groningen The Netherlands