Dr F. da Costa (Curitiba, Brazil): We have a similar experience; by the way, the longest. We have now 103 decellularized aortic allografts implanted. Follow-up is extending up to 10 years. The mean follow-up is 4.8 years. I don't think those valves will grow, to tell you the truth, but there is one striking feature of those valves, that up to 10 years, and we have several above 7 or 8 years, the CT scan shows no calcification, and the only patient that we had to redo was secondary to patient out growing the valve with subsequent stenosis—and I think you had 2 of those. We implanted a small homograft in a small kid and the kid outgrew the graft—the cusps were absolutely normal, the conduit with no calcification at all, but there was no growth. So I believe decellularized aortic allografts are going to be major advances in aortic valve surgery, but it is not going to be a living graft, as the pulmonary autograft. That is my belief at the moment.