1. Rigshospitalet, Copenhagen University Hospital , Inge Lehmanns Vej 7, 2100 Copenhagen , Denmark
2. Department of Cardiology and Cardiothoracic Surgery, Turku University Hospital , Turku , Finland
3. Department of Cardiology and Cardiothoracic Surgery, Haukeland University Hospital , Bergen , Norway
4. Skejby, Aarhus University Hospital , Aarhus , Denmark
5. Department of Cardiology, Medical Research Center, Oulu University Hospital , Oulu , Finland
6. Department of Cardiology, Sahlgrenska University Hospital , Göteborg , Sweden
7. Department of Cardiology, Landspitali , Reykjavík , Iceland
8. Department of Cardiology and Cardiothoracic Surgery, Karolinska University Hospital , Stockholm , Sweden
9. Department of Cardiology, Helsinki University Central Hospital , Helsinki , Finland
10. Abbott Structural Heart , Santa Clara, CA , USA