Invited commentary.
Messmer
Bruno
B
University Hospital Aachen, Priv. Eberburgweg 15, Aachen, D-52076 Germany. bmessmer@ukaachen.de
D006349:Heart Valve Diseases / Q000601:surgery*; D006350:Heart Valve Prosthesis; D006801:Humans; D011474:Prosthesis Design; D011664:Pulmonary Valve / Q000601:surgery*; D014184:Transplantation, Homologous