Khaidirman, S. K., Hasan, H., Andra, C. A., Lubis, H. A., Dangana, A. and Haykal, T. B. (2024) “Relationship of left ventricular diastolic dysfunction with quality of life in heart failure patients with reduced ejection fraction (HFrEF)”, Narra J, 4(2), p. e707. doi: 10.52225/narra.v4i2.707.