title: Non-controlled  observation studies.
authors: Jan P
authors: JP
authors: Amlie
mesh_terms: D005260:Female; D006330:Heart Defects, Congenital / Q000601:surgery*; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D008297:Male; D011664:Pulmonary Valve / Q000601:surgery*; D011665:Pulmonary Valve Insufficiency / Q000601:surgery*; D011666:Pulmonary Valve Stenosis / Q000601:surgery*