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US of bilateral SCM muscles in infants with CMT. (A) Longitudinal sonograms of maximum anterior–posterior diameters of the involved (MTi) and uninvolved (MTu) SCM muscles. Ratio I/U was calculated as MTi/MTu. (B) Longitudinal sonograms of the MEI of every pixel in the ROI in the uninvolved (dotted line) and involved (solid line) muscles. The K value was calculated by MEIuninvolved − MEIinvolved.
