title: Invited letter concerning: critical aortic stenosis.
authors.forename: R
authors.initials: R
authors.lastname: McKay
mesh_terms: D001024:Aortic Valve Stenosis / Q000000981:diagnostic imaging / Q000601:surgery*; D004452:Echocardiography; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007231:Infant, Newborn