<img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=799546403794687&amp;ev=PageView&amp;noscript=1">

“We really just set out to ask the question, "how much of the concussions of girls lacrosse could be directly attributed to the fact that they are prohibited from wearing the hard shell helmet with the full facemask that’s required in boys lacrosse?" said [Colorado School of Public Health professor Dawn] Comstock.