Khorchai, A., B. Rerkamnuaychoke, S. Sangkitporn, S. Duangrueng, C. Yodtup, S. Sangkitporn, and A. Herunsalee. “Detection of Down Syndrome by Multiplex Fluorescent Polymerase Chain Reaction”. Journal of Health Science of Thailand, vol. 23, no. 5, Nov. 2017, pp. 943-5, https://thaidj.org/index.php/JHS/article/view/777.