Thank you, Rob. Good morning. As Rob noted, first-quarter performance was in line with our expectations. The fundamentals of our business remain healthy, fueled by robust global demand for our innovative portfolio. We are confident in our ability to deliver on the promise of today while we make strategic investments to enable the innovations of tomorrow leveraging leading-edge science to save and improve lives around the world. Now turning to our first-quarter results, total company revenues were $15.5 billion, a decrease of 2%. Or an increase of 1% excluding the impact of foreign exchange. As expected, results were impacted by a decline in sales of Gardasil in China, of approximately $1.1 billion reducing growth excluding foreign exchange by seven percentage points. Excluding these sales and the impact from foreign exchange, global growth was 8% primarily driven by new products, WinRevair and Capfaxiv, as well as strength in oncology and animal health. The following revenue comments will be on an ex-exchange basis. In oncology, sales of Keytruda grew 6%, to $7.2 billion. Global growth was driven by increased uptake from earlier-stage cancers, and robust demand for metastatic indications. In the earlier stage setting, growth was driven by increased utilization in triple-negative breast cancer, renal cell carcinoma, and non-small cell lung cancer. In metastatic disease, we saw increased use of KEYTRUDA in combination with PADCEF in first-line locally advanced urothelial cancer. As well as Keytruda in combination with chemotherapy in first-line endometrial cancer. In the US, as previously communicated, growth was negatively impacted by approximately $250 million due to the timing of wholesaler purchases. Our broad oncology portfolio achieved strong growth driven by Wellyreg with sales increasing 63% to $137 million due to increased use in certain patients with previously treated advanced renal cell carcinoma in the US. Welireg is now the market leader in the treatment of patients with advanced renal cell carcinoma following prior therapies. In vaccines, GARDASIL sales were $1.3 billion, a decrease of 40% driven by China where we see elevated channel inventories and continued soft demand. In the rest of the world, growth was 16%. In the US, sales benefited from price and demand. Outside the US and China, growth was driven by higher overall demand including from the catch-up cohort in Japan. In pneumococcal, Cafaxib sales were $107 million driven primarily by demand from the retail pharmacy segment. We have made great progress in the early stages of this launch, and are well-positioned to help protect adults from invasive pneumococcal disease. Vaxnuvan sales increased 7% as growth from launches in international markets was partially offset by competitive pressures in the US. In cardiovascular, the strong momentum of the ongoing launch of WinRefer continues, with global sales of $280 million. The launch continues to perform in line with our high expectation and we remain excited about the significant benefit WinRevair is providing for patients. In the US, more than fourteen hundred new patients received prescriptions during the quarter. We are continuing to see a steady increase in the percentage of new prescriptions for patients whose background PAH therapies do not include apostacyclin. Outside the US, we continue to progress with launches and reimbursement. Overall, we are very pleased with the uptake of win Rever, and look forward to positively impacting the lives of more patients with pulmonary arterial hypertension. The strength of the additional data from the clinical development program which Dean will speak to in a moment, provides further confidence to physicians and patients. And supports our belief in WinRev's significant potential. Our animal health business delivered another quarter of robust growth. With sales increasing 10%. Livestock growth reflects higher demand across all species, as well as the benefit from the timing of sales in ruminants, and sales from the Aqua portfolio acquired from Elanco. Companion animal sales growth reflects price. I will now walk you through the remainder of our P&L and my comments will be on a non-GAAP basis. Gross margin was 82.2%, an increase of one percentage point driven by favorable product mix. Operating expenses decreased to $6.1 billion. There were no significant business development expenses in the quarter, compared with the $656 million charge a year ago. Excluding this charge, operating expenses grew 6% reflecting disciplined investments in support of our robust early and late-phase pipeline, and key growth drivers. Other expense was $75 million. Our tax rate of 14.2% benefited from certain discrete items. Taken together, earnings per share were $2.22. Now turning to our 2025 non-GAAP guidance. As Rob noted, we are maintaining our full-year revenue guidance of between $64.1 and $65.6 billion. This range represents growth of 1% to 3% excluding a negative impact from foreign exchange of approximately 1% using mid-April rates. Our gross margin assumption is now approximately 82%. This includes approximately $200 million in costs related to the tariffs implemented to date. Operating expenses are now assumed to be between $25.6 and $26.6 billion. This range now includes a $200 million payment related to the license agreement with Hungry Pharma, which is expected to close in the second quarter. It also includes the $300 million tech transfer payment related to Lenovo which remains in our guidance but has not yet occurred. As a reminder, our guidance does not assume additional significant potential business development transactions. Other expense is expected to be between $300 million and $400 million. We assume a full-year tax rate between 15.5% and 16.5%. We assume approximately 2.51 billion shares outstanding. Taken together, we expect EPS of $8.82 to $8.97. This range includes a negative impact from foreign exchange of more than 20¢ using mid-April rates. Recall, our prior guidance range was $8.88 to $9.03. If not for the one-time charge of $200 million related to Hongray, or per share our guidance range is unchanged. As you consider your models, there are a few items to keep in mind. Following the successful HPV catch-up vaccination program in Japan, we expect uptake to moderate as future sales will predominantly reflect the primary age cohort. As a result, global Gardasil growth excluding China while still strong, is anticipated to slow going forward. For Keytruda, the timing of wholesaler purchasing in the US negatively impacted sales by approximately $250 million in the first quarter, and is expected to positively impact sales by roughly the same amount in the third quarter. As a reminder, we lowered the list prices for the Januvia family of products in the US at the beginning of 2025. The lower list prices reduced the rebate amount our company pays to Medicaid. As a result, we expect higher net sales for these products in 2025. First-quarter sales of the Januvia family of products in the US also benefited by more than $100 million from favorable one-time true-ups. Now turning to capital allocation. Where our strategy remains unchanged. We will continue to prioritize investments in our business to drive near and long-term growth and returns for our shareholders. Our company is rapidly moving towards a future with a more diversified portfolio of growth drivers. As we continue to assess our business, we are likely to take actions that will seek to maximize the potential of these opportunities by investing with discipline while transforming our business to drive continuous productivity across the company. We intend to communicate more about these efforts later this year. We remain committed to our dividend with the goal of increasing it over time. Business development remains an important priority. We continue to actively evaluate opportunities to execute additional science-driven value-creating transactions. We increased our share repurchases in the quarter to approximately $1.2 billion similar to the full-year amount in 2024. We expect the pace of repurchase to continue at this level given our strong balance sheet. Our top priority, however, remains to invest fully behind our growth drivers and pipeline, as well as business development. To conclude, we are confident in the outlook for our business driven by our strong portfolio and exceptional pipeline. With investment in innovation, and our ongoing focus on execution we are well-positioned to deliver value to patients, customers, and shareholders now and well into the future. With that, I'd now like to turn the call over to Dean.