Ventricular Tachycardia and Early Fibrillation in Patients With Brugada Syndrome and Ischemic Cardiomyopathy Show Predictable Frequency-Phase Properties on the Precordial ECG Consistent With the Respective Arrhythmogenic Substrate - Calvo, David; Atienza, Felipe; Saiz, Javier; Martinez, Laura; Avila, Pablo; Rubin, Jose; Herreros, Benito; Arenal, Angel; Garcia-Fernandez, Javier; Ferrer, Ana; Sebastian, Rafael; Martinez-Camblor, Pablo; et al. (Circulation-Arrhythmia And Electrophysiology, 2015)