Noypa, Sukanya, Kerada Krainuwat, and Rukchanok Koshakri. 2021. “Incidence, prevalence, and factors predicting diabetic retinopathy among type 2 diabetes mellitus patients in public health centers, Bangkok metropolitan administration”. Journal of Public Health and Development 19 (1). Bangkok, Thailand:31-42. https://he01.tci-thaijo.org/index.php/AIHD-MU/article/view/242449.