出　典 Sillesen H, et al. Stroke Prevention by Aggressive Reduction in Cholesterol Levels Investigators： Atorvastatin Reduces the Risk of Cardiovascular Events in Patients with Carotid Atherosclerosis：A Secondary Analysis of the Stroke Prevention by Aggressive Reduction in Cholesterol Levels（SPARCL）Trial. Stroke 39：3297-3302, 2008 ※図表に関しましては、割愛させていただいております。