Aktas, Ibrahim, et al. “The Effect of Levosimendan on Tp-E Interval, Tp-E QT Ratio, Tp-E QTc Ratio and QRS Interval in Heart Failure Patients”. The European Research Journal, vol. 3, no. 3, Nov. 2017, pp. 220-6, https://doi.org/10.18621/eurj.278899.