Ullah, Ahsan, et al. “Health Related Quality of Life in Systolic Heart Failure Patients at Tertiary Care Unit Cardiology OPD Hayatabad Medical Complex Peshawar Pakistan”. Pakistan Journal of Public Health, vol. 10, no. 3, Mar. 2021, pp. 140-6, https://doi.org/10.32413/pjph.v10i3.501.