Mehmood, Muhammad Sajid, et al. “COMPARISON OF ARTERIAL STIFFNESS INDEX AND TPE QT RATIO IN NORMOTENSIVE, PREHYPERTENSIVE AND HYPERTENSIVE SUBJECTS”. Pakistan Journal of Physiology, vol. 14, no. 2, June 2018, pp. 34-37, https://www.pjp.pps.org.pk/index.php/PJP/article/view/217.