The claim focuses on heading, citing research that the practice is more damaging because neck muscles are weaker and cannot slow the impact of the ball on the head.
more nonense here
http://www.telegraph.co.uk/health/healthnews/11024398/Heading-a-football-is-too-dangerous-for-children-neuroscientist.html
and here http://www.dailymail.co.uk/health/article-46184/Official-Its-safe-head-ball.html and here
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Marouane Fellaini is a Man U player.