For example , the best known victims of the negative changes in their brain work are heavyweight world champions Frank Bruno , Bradley Stone , Mike Tyson and Muhammad Ali , .
The last one even suffered from the neurodegenerative disorder Parkinson 's syndrome .
For example , the best known victims of the negative changes in their brain work are heavyweight world champions Frank Bruno , Bradley Stone , Mike Tyson and Muhammad Ali , whereas the last one even suffered from the neurodegenerative disorder Parkinson 's syndrome .