1. Department of Medicine; Ålesund Hospital, Sunnmøre Hospital Trust; N-6026 Ålesund Norway
2. Norwegian University of Science and Technology; Trondheim Norway
3. Department of Medicine; Innlandet Hospital Trust, Division Lillehammer; Lillehammer Norway
4. Department of Cardiology, Rikshospitalet Medical Centre; Oslo University Hospital; Oslo Norway
5. Department of Medicine; Vestre Viken Hospital Trust, Division Asker and Baerum Hospital; Asker Norway
6. Department of Cardiology, Ullevaal Medical Center; Oslo University Hospital; Oslo Norway