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Illustration of curve definition and ISNA location. (A) The angulation of stent segment was defined as the angle formed by the tangents of the centerlines of the 5-mm proximal and distal parts of the segment. A curvature was defined if the angulation of the stent segment was >29°; (B) relationship between ISNA location and bifurcation position (schematic). Prox, proximal; Dist, distal.
