Tunkamnerdthai, Oratai, Wilaiwan Khrisanapant, Tunda Suttitum, and Panakaporn Wannanon. “Spirometric Values in Healthy Northeast Thai Children and Adolescent”. Srinagarind Medical Journal 18, no. 3 (November 25, 2013): 143–153. accessed September 17, 2026. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/14454.