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Figure 2: Threedimensionalcomputed tomography reconstruction of C7 in Group 2 whom with cervical rib. (a) Axial image of C7. The mean distance between point A1 and B1 is 20.7 mm. (b) 45° superocoronal image of C7. The mean distance from point C1 to D1 is 20.4 mm. (c) Coronal image of C7. The mean distance between point E1 and F1 is 15.9 mm 
