1. Department of Cardiology, Bispebjerg Frederiksberg Hospital, University of Copenhagen, Bispebjerg Bakke 23, 2400 Copenhagen, Denmark
2. Department of Cardiology, Rigshospitalet, University of Copenhagen, Blegdamsvej 9, 2100 Copenhagen, Denmark
3. Department of Cardiology, Hvidovre Hospital, Kettegaard Alle 30, 2650 Hvidovre Odense Hospital, J.B. Winsloews Vej 4, 5000 Odense, Denmark
4. Department of Cardiology, Odense University Hospital, Denmark