Right. So, I mean, typically, you've got two committees internally that need to review and approve these, some of them do them in parallel, some of them in sequence, but that's an Institutional Review Board, which reviews the ethical considerations for fielding a trial. And not most sites also have a scientific review committee, which essentially reviews the scientific validity of the hypothesis that is being proposed for study. Then once you get that approval, you need to go through a series of steps with each of the investigators who may be participating, if it's with a center that has a lot of oncologists that want to participate, you need to get paperwork and training done with all of them and the center is 30. You can't activate the trial until you have all 30 oncologists trained. So, in some ways, you have these very small items that can gate your ability to get the trial going. There's typically an extended process to negotiate or finalize a contract with the institution. Even though there's a template that can be used to hopefully facilitate in most cases, those discussions lawyers do. And so it's never as straightforward as you would hope. And so those are the main items. And as some of these committees only meet once a month, depending on the institution and so, the process of just getting an IRB approval can take, as I think we've discussed previously, six months, just from the time they review the materials, indicate whether how to submit it, who will be the sponsor, they have internal documentation, they have to prepare, not just our prior trial protocol. And so, that's the type of thing that that takes place. And in some cases, I alluded to this, I mean, there is literally paperwork on one dock at a major center that's holding up the whole process. And we tell them, we're willing to get going with 29 docs. We'll take 97% rather than 0% to get things going, but these sites got to decide that they like everybody to be able to go all at once. That's just how they're organized for some reason and not anything NSABP can do about that.