Sadiq, Noman, Asma Shaukat, and Uzma Riaz. 2018. “Effect of Blowing Balloon Exercise on Modulating Perceived Stress, Pulmonary Function Tests, Ventricular Depolarization and Repolarization”. Journal of Fatima Jinnah Medical University 12 (2). https://jfjmu.com/index.php/ojs/article/view/14.