Silalahi Y, Ricke Loesnihari. Relationship of HbA1c to Diabetic Retinopathy in Type 2 DM Patients at Haji Adam Malik General Hospital 2017-2018. Sumat. Med. J. [Internet]. 2021Sep.7 [cited 2024Nov.23];3(3). Available from: https://talenta.usu.ac.id/smj/article/view/3626