Suwanasri, C., Skulchan, N., Leelakajohnkit, S., Sakunkaruna, Y., Thermworakul, L., & Sukjai, S. (2012). Changing of output of ultrasound among before, after 1 and 2 months of use in a physical therapy clinic. Archives of Allied Health Sciences, 24(1), 110–116. Retrieved from https://he01.tci-thaijo.org/index.php/ams/article/view/66269