To both of you, do you consider the fact that there may in fact be a new technology around the corner? One of the things I'm thinking about is simply the pace. I get that you're going to fit the technology to the patient, but that assumes a static level of technology. The concept of innovation is that there are going to be new opportunities and new technologies that one would be able to fit to the patient all the time.
These are huge investments, presumably. How do you manage that piece of it, or is that not part of your considerations at all, what may be coming?