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Seo JH, Lee MY, , Kwon HG.  Comparison of Muscle Activation on Cervical and Lumbar Erector Spinae, and Upper Trapezius according to Sitting Postures while using a Smartphone in a Bathroom.  J Korean Soc Phys Med 2019;14:71-77.  https://doi.org/10.13066/kspm.2019.14.2.71