Kaif, Maha, Syed Ali Sabir, and Sidra Hamid. “Variation of Systolic Blood Pressure in Relation to Biological Variables and Risk Factors”. Journal of Rawalpindi Medical College 23, no. 2 (May 2, 2019): 105-108. Accessed October 22, 2019. http://journalrmc.com/index.php/JRMC/article/view/1108.