Percutaneous pulmonary valve implantation: impact of evolving technology and learning curve on clinical outcome. - Lurz,P.; Coats,L.; Khambadkone,S.; Nordmeyer,J.; Boudjemline,Y.; Schievano,S.; Muthurangu,V.; Lee,T.Y.; Parenzan,G.; Derrick,G.; Cullen,S.; Walker,F.; et al. (Circulation, 2008)