A more detailed article at Reuters:
Fruits and vegetables linked to stroke prevention
http://www.reuters.com/article/2014/05/08/us-stroke-diet-prevention-idUSKBN0DO1L320140508
“The researchers found that citrus fruits, leafy vegetables and apples and pears were the specific types of greenery linked to reduced stroke risk.”
If Anybody cares, I found the original article published in “Stroke” magazine:
http://stroke.ahajournals.org/content/early/2014/05/08/STROKEAHA.114.004836.full.pdf+html
You don't know if those who had a stroke would have had one no matter how many vegies in their diet.