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Figure 4 Relationship between change in wall thickness (wall thickness_follow-up – wall thickness_baseline) attributable to 24 months of treatment with simvastatin and wall thickness at baseline. Closed circles = 1 to 3 cm, segment I; open squares = 3 to 5 cm, segment II; closed triangles = 5 to 7 cm, segment III; closed squares = 7 to 9 cm, segment IV.