Kanwal Abbas Bhatti, Noor Nabi Siyal, Altaf Hussain Memon, Ghulam Muhammad Phull, Hanozia Hassan, Mukhtiar Ahmed Abro, “A Comparative Study of ECG and Blood Pressure among Smokers and Non-Smokers”, Pakistan Journal of Medical & Health Sciences, vol. 16, no. 03, p. 635, Apr. 2022.