Timinkul, Aomkhwan, Katavut Phiwjinda, and Wilawan Chaiut. “Comparison of Respiratory Muscle Strength between Native Lowlands and Native Highlands Populations in Chiang Rai”. Srinagarind Medical Journal 33, no. 3 (May 5, 2018): 235–240. accessed September 17, 2026. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/122216.