1. Department of Medical Sciences, Cardiology, Uppsala Universitet , 751 85 Uppsala , Sweden
2. Department of Medicine , Visby Lasarett, 621 55 Visby , Sweden
3. Department of Medical Sciences, Epidemiology, Uppsala Universitet , 751 85 Uppsala , Sweden
4. Department of Medicine, Norrtälje Hospital (TioHundra AB) , 761 29 Norrtälje , Sweden
5. Department of Medical Sciences, Örebro Universitet , 701 82, Örebro , Sweden
6. Department of Cardiothoracic Surgery, Anaesthesia and Intensive Care, Lund University/Skåne University Hospital , 221 84 Lund , Sweden
7. Department of Public Health and Clinical Medicine, Umeå University, and Heart Centre, Umeå University Hospital , 901 85 Umeå , Sweden
8. Uppsala Clinical Research Center , 751 85 Uppsala , Sweden
9. Department of Cardiology, Sahlgrenska University Hospital , 413 45 Gothenburg , Sweden
10. Department of Cardiology, Karolinska Institutet , 171 77 Stockholm , Sweden