Dave, we're seeing pretty much all of that. So the second quarter was, obviously, a terrific quarter, it was particularly strong. So kind of all things hitting on multiple cylinders. Lots of studies with larger animals, a fair amount of specialty work and a fair amount of long-term work. Some work which happens often, but you never know when. Some large studies that were originally contemplated for the first quarter ended up moving into the second quarter. So we had a big bolus of work. The margin, obviously, is driven by having a great quarter, having a great mix of work like that and that's driving efficiency. So the margin is a combination of all of the above. We're expecting a really good third quarter and fourth quarter, where as we step back from the second quarter and kind of look at industry and the demand and the competition, and particularly the pricing, we're very cognizant of the fact that this is feeling, at least at the moment, very much because of the price, like kind of a mid-single-digit growing business for us. And maybe we'll get to high single, but that's not what we're guiding to. So we're expecting a strong quarter that will appear to moderate off of the second only because it was unusually strong. We're trying to get others besides us to look at the Safety Assessment business on an annual basis, because as you know pretty well, since you're familiar with the space, studies don't start and conclude commensurate with our corporate reporting quarters. They have different durations. And so taking a holistic view of it -- notwithstanding the quarterly conversations like this one -- we just think is a much better view. So we don't feel -- just to get to the essence of your question, we don't feel like we are being inappropriately or overly conservative. The back half of the year for all of our businesses tends to be somewhat adversely impacted by the holidays and summer slowdowns and sometimes running out of budget. It's not some overly cautious response. It's just cognizance of, while demand is very good and obviously we had a really strong quarter and so have others in the industry, and all systems point positively, given the fact that there's still a bit too much capacity in the system, we still don't have the level of pricing that should be commensurate with the volume and demand. And if and as we do, both the top and bottom line will begin to move much more quickly. So I guess, in a lot of ways, we continue to be cautious about pricing, and while we're delighted with the quarter, I would say that studies are still quite competitively bid and, yes, we talked about the fact that we win some studies where we're not the lowest price point, but price is still an important part of the evaluation process.