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Figure 1: Threedimensionalcomputed tomography reconstruction of C7 in Group 1 whom without cervical rib. (a) Axial image of C7. The mean distance between point A and B is 5.4 mm. (b) 45° superocoronal image of C7. The mean distance from point C to D is 17.6 mm. (c) Coronal image of C7. The mean distance between point E and F is 12.7 mm 
