Premier League stars join study to improve concussion detection

Premier League footballers are taking part in a British research project that could revolutionise how sport diagnoses and treats concussions.

Led by Professor Tony Belli, researchers have spent the last two years gathering saliva and urine samples from English Premiership and Championship rugby union players to fine-tune a "breakthrough" in using bio-markers to spot concussions and work out when those affected can return to play.