Heart rate variability before the onset of ventricular tachycardia: differences between slow and fast arrhythmias - Meyerfeldt, U; Wessel, N; Schutt, H; Selbig, D; Schumann, A; Voss, A; Kurths, J; Ziehmann, C; Dietz, R; Schirdewan, A (Int J Cardiol, 2002)
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