We file the original U.S. provisional application because it's a simpler process. I think there's a Canadian [Inaudible--Editor], but we just have that as our standard process. That part isn't reviewed, so in some ways it doesn't matter where that part is filed.
When we enter the national phase, our evaluation of that depends on the market opportunity, where we think the potential licensees or market is going to be for that invention, and also just the cost of what that's going to be.
Typically we don't file in Europe and Asia because of the translation costs, unless we have someone who's going to be picking up those costs.