1 Department of Cardiology, Heart Valve Clinic, University of Liège Hospital, GIGA Cardiovascular Sciences, CHU Sart Tilman, CHU du Sart Tilman, 4000 Liège, Belgium.
2 Department of Cardiovascular Research, Gruppo Villa Maria Care and Research, Anthea Hospital, Via Camillo Rosalba, 35, 70124 Bari, Italy.
3 King's Health Partners, King's College Hospital NHS Foundation Trust, Princess Royal University Hospital, Farnborough Common, Orpington, BR6 8ND London, UK.