Khan, Farzana, Robina Usman, Shafaq Zafar, and Shamaila Wadud. “VITAMIN D DEFICIENCY IN PATIENTS WITH DIABETIC RETINOPATHY”. Journal of Postgraduate Medical Institute 31, no. 2 (May 12, 2017). Accessed November 24, 2024. https://jpmi.org.pk/index.php/jpmi/article/view/2022.