K S, P., and S. Devatha. “The Severity of Diabetic Retinopathy and Its Relationship With Duration of Diabetes and Hypertension”. International Journal of Medical Research and Review, Vol. 12, no. 4, Aug. 2024, pp. 93-98, https://ijmrr.medresearch.in/index.php/ijmrr/article/view/1481.