Wanapirak, C., S. Sirichotiyakul, C. Kunaviktikul, W. Piyamonkol, and R. Sekararithi. “Cordocentesis in Chiang Mai University Hospital : 286 Cases Experience”. Thai Journal of Obstetrics and Gynaecology, vol. 8, no. 2, Apr. 1996, pp. 79-86, https://he02.tci-thaijo.org/index.php/tjog/article/view/257688.