Fragata Filho, Abilio Augusto, et al. “Evaluation of Tpeak–Tend and QT Intervals in Chagas’ Disease, Chronic Phase and Normal Electrocardiogram”. JOURNAL OF CARDIAC ARRHYTHMIAS, vol. 32, no. 4, Apr. 2020, pp. 230-5, https://www.jca.org.br/jca/article/view/3373.