 They're risky. Like you said, it's expensive. I know someone that was flying, and this seems crazy, but of course he's got a degenerative disease, but he was flying to Germany every month for stem cell injections because as you mentioned earlier, they don't last, right? If they work, if you see results when you get them, they generally don't last. You have to go back again and again. And the other interesting thing is that those injections are localized. They're not systemic. So what do we mean by that?