Yes. Chris, thanks for the question. I mean, I think we continue to see 227 and 9LA as being thought of in the U.S. very much in conjunction with one another. If you go back, what we hear consistently from physicians who have seen the 227 data is that; number one, they're impressed with the potential for long-term survival with dual I-O therapy. They note the depth and durability of complete remissions, all coming with a very manageable safety profile. And so, they see that as an important opportunity for patients who either don't need or don't want chemotherapy. And incidentally, I would say, that the NCCN listing, 2A listing that we got back in December is a recognition both of the unmet need that continues to exist in first-line lung cancer, as well as the potential that exists for dual I-O therapy. What 9LA then brings to the table is, answering the question, for those patients who do need chemotherapy, does concomitant chemotherapy, two cycles in this case, along with dual I-O therapy, provide a benefit? And we're very happy to see a second study that demonstrates overall survival. So as physicians in the U.S. think about these studies, they very much think about them in combination with one another. And that's an important part of how we are going to think about our long-term strategy in first-line lung cancer. As it relates to 2020 and how we think about the business, let me say just a couple of things. First of all, the business for Opdivo in the U.S. continues to perform in line with our expectations. In second-line lung cancer, eligibility is still on the order of 30% to 35%. We expect that's going to flatten out around 30% this year. Our shares are holding stable in the 35% to 40% range. The business continues to be stable in metastatic melanoma. We continue to have a leadership position in adjuvant melanoma. And again in first-line renal, our business is stable in our approved indications. As we think about this year, as David mentioned, the business is going to continue to still be under pressure. As a reminder that pressure really comes from three tumors: it's second-line lung cancer, where we've talked about the dynamics there; and it's small cell; and head and neck. And in those two tumors it's a very similar dynamic to lung cancer, where you've seen competitive approvals in the first-line impacting eligibility in the second line. But I would say importantly, our assumption for this year is that our shares in the second-line setting across those tumors remain stable. It's just stable within a smaller pool of patients.