The player might want to as well, but the player doesn't have a choice. It's regulated by a third party independent commission, which I think is interesting.
Like every other professional sport, we are very concerned about health and safety. We're concerned about head injuries. We're concerned about concussions. We are actually funding and supporting primary research in several university hospitals in the United States to make sure we're knowledgeable and informed about this, and we continue to do these things. But, again, providing for the consistent regulatory environment will allow for promotions, big and small, to be held to the same standards.