Six-minute walking test predicts long-term cardiac death in patients who received cardiac resynchronization therapy. - Castel MA; Méndez F; Tamborero D; Mont L; Magnani S; Tolosana JM; Berruezo A; Godoy M; Sitges M; Vidal B; Roig E; Brugada J (Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology, 2009)