It is sad to say how come they didn't care to do any studies before then. There are so many studies about head and neck injuries in American football.No problem. It's just that I really was curious about that heading the ball thing. In fact in your link it says “What’s unique about this study is this is the first study ever to quantify heading as an exposure,”
Very interesting study. Never thought about it but the ball is quite heavy indeed, and as the article states the real bulk of soccer heading happens during practice sessions, so it does make sense.