title: Valve-in-valve or super imposition of mechanical valves on impacted bioprostheses.
authors.forename: K
authors.initials: K
authors.lastname: Al Ebrahim
mesh_terms: D001705:Bioprosthesis; D006350:Heart Valve Prosthesis; D006801:Humans; D008943:Mitral Valve; D011183:Postoperative Complications; D011474:Prosthesis Design; D012086:Reoperation