1. Department of Cardiology, Sahlgrenska University Hospital, Gothenburg, Sweden
2. Department of Cardiology, Hacettepe University Hospital, Ankara, Turkey
3. Department of Cardiology, Södra Älvsborgs Sjukhus, Borås, Sweden
4. Department of Cardiology, Skaraborg Hospital, Skövde, Sweden
5. Department of Cardiology, Allingsås Hospital, Allingsås, Sweden