Bastola, P., F. Kahsay, S. Zewengiel, and M. M. Muguleta. “The Prevalence of Diabetic Retinopathy, Risk Factors, Visual Impairment and Ocular Status Among Patients With Diabetes Mellitus Presenting to Berhan Aini National Referral Hospital, Eritrea: A Hospital Based Study”. Journal of Chitwan Medical College, vol. 6, no. 4, Feb. 2017, pp. 37-46, https://www.nepjol.info/index.php/JCMC/article/view/16714.