Khattak, Tariq Hussain, et al. “ELECTROCARDIOGRAPHIC CHANGES IN ACUTE PULMONARY EMBOLISM WITH RIGHT HEART STRAIN AND IT’S ASSOCIATION WITH ADVERSE CLINICAL EVENTS”. Pakistan Armed Forces Medical Journal, vol. 68, no. Suppl-1, Mar. 2018, pp. S28-33, https://pafmj.org/PAFMJ/article/view/3262.