title: Long-term morbidity and mortality after aortic and mitral valve replacement with tissue valves and certification to fly.
mesh_terms: D000337:Aerospace Medicine; D001021:Aortic Valve / Q000601:surgery; D001705:Bioprosthesis; D006350:Heart Valve Prosthesis / Q000401:mortality; D006801:Humans; D008004:Licensure; D008943:Mitral Valve / Q000601:surgery; D009017:Morbidity; D013997:Time Factors