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Rugby Union's Six Nations championship kicks off this evening in Cardiff, with Wales against England live on 大象传媒1 TV and Radio 5-live.

Statistics show that the number of rugby injuries per season has remained fairly stable since the game went professional 20 years ago.

However, the players in the upper levels of the game are bigger, stronger and faster than before with the ability therefore to deliver more violent physical contact on the pitch.

The game now has real concerns about concussion and its potential after-effects. Rob Bonnet reports.