Let's start with deferrals. Deferrals, as we look at the dynamics in fourth quarter, electives continue to press into the early parts of December, but then decreased heavily towards the back part of December. We don't know how much of that was pulled forward, as far as it depends highly on the segment we're talking about. We saw in certain areas of cervical more push towards the ASC environment. And that kept further --kept procedures going further into the part of December. However, the highly elective complex procedure cases, those started to attenuate earlier in the December month. That trend has continued on into January, into the mid-February, where the highly complex procedures are being postponed because they require multi day hospital stays. And so, it's hard to handicap how much of that is pushed forward. But the point about those patients is that they are deferred, those complex cases will not get better on them sit by themselves. And so, we see them as deferred cases, which will pick up in the months to come. But it's difficult to talk about when that might occur, because hospitals all have capacity issues right now. So, there's a high capacity, full capacity currently today and how do we fit in those patients over the last six weeks will be determined by the hospital specifics, specifically. On the FDA re-class, we don't know exactly the timing on that as well. We discussed the timing where October they closed their open comment period. And typically, in a re-class, it takes six to 12-months for them to come and reaffirm their position or accept the panel's decision. So, this is a little different situation. So, we don't know whether it's going to be three months, six months, nine months, or 12 months from that close date. We're monitoring it closely. The good news regarding that is that, even as a re-class that has robust clinical data, we believe we're well positioned the way we operate that business. We have a very strong sales and service team. We have a strong order to cash. We have our very large contract basis as far as to be in all counts. And then we also have very robust clinical data, which further positions us in the marketplace. And so, will there could be new entrants and there will be new entrants. We think we're well positioned to address those.