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Yu GS, P.t. , Kim MB, P.t. , Cho PH, Ph.d .  The Effect of Abdominal Muscle Contraction Using Waist Circumference Change Sensors on Trunk Muscle Endurance and Postural Control in Healthcare Workers.  PNF and Movement 2019;17:451-461.  https://doi.org/10.21598/JKPNFA.2019.17.3.451