Stroke recurrence risk is highly concentrated in the period immediately after the index event. Why? What is the basis for the extreme clustering of recurrent events into this narrow sliver of time?

中文翻译：

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复发性中风更像是篝火还是电灯开关？

中风复发风险高度集中在指标事件发生后不久的时期。为什么？如此短暂的时间里反复发生的事件极端聚集的基础是什么？