Ashraf, Hira, et al. “COMPARISON OF T WAVE ALTERNANS IN PATIENTS WITH CARDIOMYOPATHY AND HEALTHY CONTROLS: T Wave Alternans in Cardiomyopathy”. Pakistan Armed Forces Medical Journal, vol. 67, no. 4, Aug. 2017, pp. 560-64, https://www.pafmj.org/PAFMJ/article/view/682.