Boonla, O., Prasertsri, P., Rungsawat, U., Namkhum, S., PaepetchSuato, B. and Luangpon, N. 2017. An Eight-Week of Inspiratory Muscle Training Program Improved Chest Expansion in Subjects with Inspiratory Muscle Weakness: A Preliminary Study. Srinagarind Medical Journal. 32, 4 (Jul. 2017), 120–126.