title: Lessons from the learning curve.
authors.forename: Peter C
authors.initials: PC
authors.lastname: Block
mesh_terms: D001021:Aortic Valve / Q000473:pathology*; D002404:Catheterization / Q000295:instrumentation*; D005260:Female; D006349:Heart Valve Diseases / Q000628:therapy*; D019918:Heart Valve Prosthesis Implantation / Q000295:instrumentation*; D006801:Humans; D059032:Learning Curve; D008297:Male