Boonvisudhi, Kanoknat, Prapat Wanitpongpan, and Alita Changnoi. “Nomogram of the Lungs Area by Tracing Method to Head Circumference Ratio in Normal Thai Fetuses at 20-40 Weeks of Gestation”. Siriraj Medical Journal 66, no. 3 (May 1, 2014). Accessed April 20, 2024. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/55276.