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Bland-Altman plots of intra- and interoperator reliabilities for measuring the upper trapezius at 0° of cervical flexion. (a, b) Intra- and interoperator reliabilities of assessing upper trapezius stiffness at 0° of cervical flexion. (c, d) Intra- and interoperator reliabilities of assessing upper trapezius stiffness at 50° of cervical flexion (the continuous lines represent the mean difference, while the dotted lines show the 95% upper and lower limits of agreement).
