How we discovered that heading a football causes impairment of brain function

Citation

Ietswaart M, Hunter A & Di Virgilio T (2016) How we discovered that heading a football causes impairment of brain function. The Conversation. 24.10.2016. https://theconversation.com/how-we-discovered-that-heading-a-football-causes-impairment-of-brain-function-67468

Abstract
First paragraph: Heading a football may look effortless but many scientists have suspected it might actually harm the player’s brain. There could be real consequences – we know that brain injury is linked to an increased risk of dementia, for example. However, it has proven surprisingly difficult to find out the true impact of football heading, partly because mild brain injury is notoriously difficult to detect.  Access this article on The Conversation website: https://theconversation.com/how-we-discovered-that-heading-a-football-causes-impairment-of-brain-function-67468