Okay, good, Jon, and we'll take the follow-on obviously. IDS was interesting and first, we did see a good solid T&E event and particularly what we're seeing is in our DAC region which is Germany, Austria, Switzerland. And we talked to positive IDS results. It's hard to measure and what we were trying to figure out is how much purchasing is going to go on from beyond the dark region, because with 160,000 dentists become a very global event, where we going to see purchases. So, two things that I think we learned this IDS is that the world comes to shop at IDS, the doc, dentist come to buy. Now, the interesting impact for us that's kind of been the positive, but it's also has an offset is that particularly out of Asia, they all saw Primescan. And they all were very excited about Primescan, when we have Primescan and the problem with Primescan, we didn't have it approved. We've just gotten prime approved in Japan recently. And so, as a result, we saw a less T&E in rest of the world then we might have, if they hadn't been shopping and you've seen IDS. So, I view IDS and the word we use is shopping and we had great traffic, we had great results, very positive feedback from all the dentists that attended the event. But they go back to Japan and want to purchase Primescan and Primescan wasn't there. And as a result, we didn't sell as much omni as we may have thought we were going to, because we saw the different anticipation of when Primescan is going to come out. So again, I think IDS show that it's a very good event for us in Central Europe. We have to be thoughtful about how we forecast that business two years from now. But we're -- look, we think we had a great IDS just in terms of we were able to expose dentists to SureFil, we were able to expose them to just stuff like TruNatomy preemptively. So, it was -- in my mind, kind of like a global launch. And that saves us a lot of time from a global launch perspective, when those sales show up, is going to be more a function of when approvals are by region, then specifically tied to the IDS event.