We've been working on this project since about 2005. Back in the 2000s, we saw a tremendous rise in foot and ankle injuries in the NFL and we were trying to figure out why this was happening. This has been an ongoing project of ours, trying to figure out why we have so many Lisfranc, turf toes, high ankle sprains and those kinds of things occurring. What we have basically found out is that it is multi-factorial. It's a combination of the players being faster and stronger, having higher energy injuries and the fact that probably the shoes have changed -- lighter weight and more flexible, bending at the wrong place perhaps -- and then then role of the artificial surface comes into play. What we're finding basically is that when the cleat engages with turf, if it doesn't release at a certain level of torque, then injury can occur. That's why we're seeing so many ankle injuries, ACL injuries. We're aren't blaming this on anybody. We're aren't saying it's all the artificial surface's fault. It's not the shoe maker's fault. It's certainly a combination of multiple factors.