借D兄的帖和Z大夫共同学习， share两个 关于strock 的两个links

By American strock association:

http://www.strokeassociation.org/STROKEORG/AboutStroke/TypesofStroke/Types-of-Stroke_UCM_308531_SubHomePage.jsp#mainContent

By Web med
http://www.medicalnewstoday.com/articles/7624.php

对今天年龄趋近中老的一族读下有益无害