(Reuters) - Football needs more data on the links between heading the ball and dementia before restrictions on training are imposed, the chief medical officer of the global players' union FIFPRO said.
The issue of dementia in the professional game was sparked by the death of England's Nobby Stiles, who along with many of his 1966 World Cup-winning team mates, including Jack and Bobby Charlton, had been diagnosed with the condition.
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