Boonnuch, Wiroon. “Pre-operative and 24 hourPost-operation Changes of Peak Expiratory Flow RatePrediction Post-operation Pulmonary Complications”. Siriraj Medical Journal 67, no. 3 (July 5, 2015). accessed September 2, 2026. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/55242.