Samutchaikij, T., and P. Tongsawatwong. “The Prevalence of Vertical Transmission of HIV Infection in Maharat Nakorn Ratchasima Hospital”. Thai Journal of Obstetrics and Gynaecology, vol. 19, no. 1, Apr. 2017, pp. 7-11, https://he02.tci-thaijo.org/index.php/tjog/article/view/1260.