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Survival analysis using Kaplan–Meier method of the presence of recurrent stroke ((a) Panel A) and death ((b) Panel B) during 7 years in the population of 448 patients with ischemic strokes according to presence of arterial calcifications in intracranial vertebral arteries and/or basilar artery. Vertical lines represent censored data. VBC+: vertebrobasilar calcifications present. Crosses represent censored (died and lost to follow-up) data.
