In a cohort study of 205 adolescent football players and 70 noncontact control athletes, adolescent football players showed signs of altered brain structures including cortical thinning and changes in brain folding.
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2814507
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https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2814507
https://redd.it/1ahftdh
@r_sciencegeeks