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Lee HJ, Lee YS, Jeong JY, , Seo DK.  Correlation between Tone of Suboccipital Muscle and Endurance of Deep Neck Flexor Muscle according to Angle Changes in College Students.  J Korean Soc Phys Med 2019;14:137-144.  https://doi.org/10.13066/kspm.2019.14.2.137