Boontantrapiwat, S., and S. Chuen-im. “A Result of Diabetic Retinopathy Screening by Non-mydriatic Fundus Camera in Krathumban Hospital Samut Sakhon Province”. Region 4-5 Medical Journal, vol. 31, no. 4, Sept. 2018, pp. 353-8, https://he02.tci-thaijo.org/index.php/reg45/article/view/144579.