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Seok H, P.t. , Lee BY, P.t. , Kim PH, P.t. , Ph.d .  The Correlations between a Forward Head Posture and the Endurance and Maximal Voluntary Contraction of the Deep Neck Flexor, Neck Pain, and the Changed Position of the Mandible.  PNF and Movement 2019;17:471-480.  https://doi.org/10.21598/JKPNFA.2019.17.3.471