Rugby dementia study: Ben Kay and Shane Williams join head injury research
News from the BBC
Fifty former elite rugby players are being recruited to a study into whether they are more likely to show early warning signs of dementia.
Those involved include England's Ben Kay and Wales' Shane Williams.
The Alzheimer's Society work comes amid growing concern over long-term head-injury risks in rugby and football.
Governing body World Rugby welcomed the study and said it would "assist in broadening understanding around this incredibly complex area of medicine".