Kongtham, Tanawat. 2020. “Prevalence and Factors Associated with Diabetic Retinopathy in Type 2 : Diabetes Mellitus Patients at Pai Hospital, Mae Hong Son Province”. MEDICAL JOURNAL OF SISAKET SURIN BURIRAM HOSPITALS 35 (1):13-25. https://he02.tci-thaijo.org/index.php/MJSSBH/article/view/241264.