1. University of Liège Hospital, GIGA Cardiovascular Sciences, Departments of Cardiology, Heart Valve Clinic, CHU Sart Tilman , Domaine Universitaire du Sart Tilman B.35, 4000 Liège , Belgium
2. Gruppo Villa Maria Care and Research, Maria Cecilia Hospital, Cotignola, and Anthea Hospital , Bari , Italy
3. National Heart Research Institute Singapore, National Heart Centre Singapore , Singapore