1. Department of Cardiology, Leeds General Infirmary, United Kingdom (M.A., D.J., D.J.B.).
2. Structural Heart Valve Research and Development Campus, Boston Scientific Corporation, Ballybrit, Galway, Ireland (C.F.).
3. Centre for Heart Valve Innovation, St. Paul’s Hospital, University of British Columbia, Vancouver, Canada (J.S.).
4. Heart Center, Rigshospitalet, Copenhagen, Denmark (O.d.B.).
5. Heart Center Leipzig, University of Leipzig, Germany (M.A.-W., A.A.).
6. Thoraxcenter, Erasmus Medical Center, Rotterdam, the Netherlands (N.M.V.M., M.v.d.D.).
7. Sussex Cardiac Centre, Brighton, United Kingdom (S.A., D.H.-S.).