Rachatakarn, R., Rittimanomai, P., Itthithat, P. and Yuenyongchaiwat, K. 2017. Preliminary Outcome of the Effect of Slow and Deep Breathing Exercise Program on Respiratory Muscle Strength in Healthy Participants Aged 18 – 25: a Randomized Control Trial. Journal of Health Science of Thailand. 25, 3 (Nov. 2017), 387–393.