Soontornthip, Jitsak, Joseph Henry Leonard, Sompong Sriburee, Samatchai Chamnongkich, Aatit Paungmali, Ubon Pirunsan, and Patraporn Sitilertpisan. 2023. “Reliability of transversus abdominis and internal oblique muscle thickness measurement using B-mode ultrasound imaging in standing and single leg standing positions”. Journal of Associated Medical Sciences 56 (2):53-59. https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/259979.