Brian, answering your second question about how we see the blood testing market evolve. As you know, we have our own blood testing program. And at a high level, here's the way you should think about the opportunity. So there is an opportunity for additional testing. The path however, is a rigorous 1 as the path was very rigorous for Cologuard. So you should think about five different elements to this. The first is that we know that blood testing will be less accurate than Cologuard and certainly less accurate than colonoscopy. The second is that FDA approval and getting an equivalent claim to Cologuard is probably going to be challenging for all of those who are aspiring to enter the colon cancer screening market with a blood-based test. We'll get into those details. Third, the bar for guideline inclusion is high, and there is no guarantee that blood test will meet that bar. We'll talk about that. Pricing is likely to be below $200, and we'll talk about that as well. And finally, and maybe most importantly is there is going to be a challenge in getting physicians to order a less sensitive or less accurate test for colorectal screening. Let's take these out one at a time. And if we could bring up a slide with the model comparison between Cologuard and a theoretical blood test. As you see here, importantly, regulators guideline groups and also physicians and patients will look at performance difference in tests. At a high level, of course, overall cancer sensitivity is important. When you drill down those 75% of the cancers and the ones that you screen for are Stage 1 and 3 cancers. And we would expect Stage 1 sensitivity to be approximately 70% because there are so many more early-stage cancers in a screening study, like there were 45% of all the cancers found in the DeeP-C study were Stage 1, 75% were Stage 1 or 2. The overall cancer sensitivity is likely, we believe, to be in the 80% to maybe 85% range. Advanced adenoma or pre-cancer sensitivity is very important for -- especially for guideline inclusion. We'll get into that and specificity is similar between we believe the two technologies. But overall, the performance difference is stuck. And -- the FDA -- and this gets to the second point is that, the FDA historically does not like to see performance degradation with new technologies that are subject to PMA or de novo 510(k) approval, We’ve seen two examples of this in colon cancer screening in the recent past. One is Septin9, which is a blood-based test with inferior performance for detecting cancer and precancerous polyps than Cologuard. The panel meeting for that was at the same time, actually the day before the Cologuard test. FDA eventually approved Septin9, but they did it with a very -- with a limited label compared to Cologuard. Their label said it must be offered and refused to -- first patients must be offered and refused the range of other tests that were recommended by the main guideline group at that time. The second example is the Pillcam, which has a 510(k) de novo clearance for screening, but only in instances when a colonoscopy can't be completed. So those are two examples of where you have performance degradation and as a result, the claim language was changed. The FDA's view on this hasn't changed. We don't think it will change. And we think there is a role for blood-based testing. But marketing a test with inferior claim language is certainly going to be a challenge. Next, guideline inclusion. So as you know, I've been doing this for a long time and had been through the USPSTF process. You have to love modeling if you are going to dive into these details. But the USPSTF is the main guideline group and their guidelines are based on these rigorous statistical modeling approach that is largely dependent on advanced adenoma detection first. That's about 60% of all of the impact comes from advanced adenoma detection and then cancer sensitivity weighted towards earlier stage. And this next slide shows that relative to Cologuard, a CRC blood test with a similar interval detects significantly fewer cancers and pre-cancers and thus leads to a significant degradation in life years gained. It holds a number of colonoscopies constant or roughly constant and that ratio is important. But as you can see there, the ratio of life years gained to the number of colonoscopies, which is the main test that USPSTF looks at is significantly lower for a blood test at three years. So the only way a blood test really gets into guidelines is if it's an annual test. And let me take a step back. This modeling assumes 100% adherence -- that means everybody offer the test gets it, and they get it exactly when they should get it. We know that's not realistic, but that's the way the modeling is done. And that's why the FIT test outperforms Cologuard here is because it assumes that a fit test has done every single year exactly on the anniversary. We know that's not remotely realistic but that's how you end up in the same ballpark. As you can see, the FIT past Cologuard colon has to be all outperformed a blood test, even with this pretty decent performance of relatively high cancer detection. So if the test is not included in the guidelines at three years, which here it wouldn't be. And it would have to be every year. Now what is the implication of that. Medicare is going to look at this as they look at pricing a test. So you can think Cologuard at every three years was priced just under one third of the Medicare average for colonoscopy screening, which was indicated for 10 years. So 10 divided by 3 roughly got you to $500 a test. 500 divided by 3, we believe, gets you into somewhere between $100 and $200 a test. That makes this very challenging with sequencing technology or for that matter, even PCR testing. Finally, this performance difference, guideline challenges, FDA challenges also creates hurdles for customer adoption. Now we have been actively promoting Cologuard to primary care physicians for eight years. We know this market well, even with a large commercial organization and a large marketing effort, there is still a bias towards colonoscopy. We, obviously and based on this last quarter, are showing our progress there. But that is with sensitivity for cancer, strong preconcert and specificity data. We believe that our blood test will be very challenged to -- and we believe our blood test will perform very similar to others based on the data that we've seen today. But this is going to be a real challenge to get adoption. We believe this is the right way to look as the realistic way to look at blood cancer testing. We hear a lot about it. It’s usually only small pieces of this complex puzzle. This is the whole puzzle.