1. Department of Cardiology, University of Liège Hospital, GIGA Cardiovascular Sciences, Heart Valve Clinic, CHU Sart Tilman, Belgium (P.L.).
2. Gruppo Villa Maria Care and Research, Maria Cecilia Hospital, Cotignola, Italy (P.L.).
3. Anthea Hospital, Bari, Italy (P.L.).
4. National Heart Research Institute Singapore, National Heart Centre Singapore (Y.Y.G.).