title: Invited commentary.
authors.affiliation: Department of Cardiac Surgery, University Clinic Gasthuisberg, Herestraat 49, Leuven, B-3000, Belgium. willem.flameng@uz.kuleuven.ac.be
authors.forename: Willem
authors.initials: W
authors.lastname: Flameng
mesh_terms: D001021:Aortic Valve; D001022:Aortic Valve Insufficiency / Q000601:surgery*; D015444:Exercise; D005500:Follow-Up Studies; D006350:Heart Valve Prosthesis; D006352:Heart Ventricles / Q000473:pathology; D006439:Hemodynamics; D006801:Humans; D009929:Organ Size; D011474:Prosthesis Design; D012146:Rest; D016896:Treatment Outcome