Aijaz Zeeshan Khan Chachar, Khushbakht Tanveer, Sana Arshad, Humaira Nazir, Mohamed Abdullahi Adam, Mohsin Asif, “Frequency of Diabetic Retinopathy in already diagnosed cases of Diabetes Mellitus- A single center Experience”, Pakistan Journal of Medical & Health Sciences, vol. 16, no. 08, p. 146, Sep. 2022.