1. Heart Center, Turku University Hospital and University of Turku,
Turku, Finland
2. Heart Center, Tampere University Hospital,
Tampere, Finland
3. Heart Center, Satakunta Central Hospital,
Pori, Finland
4. Division of Cardiology, Department of Medicine, Oulu University Hospital,
Oulu, Finland
5. Department of Internal Medicine, South Karelia Central Hospital,
Lappeenranta, Finland