Thank you, Mike. Biogen has remained focused on strong execution across our core business in MS, SMA and biosimilars, while continuing to advance our strategy of building a multi-franchise portfolio. I want to reiterate our commitment to maximizing returns to our shareholders and bring in innovative participation now and over the long-term. This requires that we continue to allocate capital efficiently, effectively, and appropriately. As we have demonstrated in the past, we will always strive to have an optimal capital structure, as well as aim for superior returns from investments we make. Again, we are actively preparing for the aducanumab Advisory Committee and a potential launch. The unmet medical need and cost to society for Alzheimer's are tremendous and mounting. Alzheimer's creates a cost burden of approximately $550 billion per year in the U.S and the cost for caring for an Alzheimer's patient can be over $0.5 million. Alzheimer's deprives many patients of the independence. By the age of 80, approximately 75% of people with Alzheimer's disease live in a nursing home at a per patient cost of approximately $100,000 per year. The approval of aducanumab would be an unprecedented milestone for patients, their families and society at large, and will represent an important short-term and long-term growth driver for the company. Finally, we are focused on advancing our broader purpose as an organization, as we aim to pioneer science for the betterment of humanity. This includes doing the right thing for patients, our employees, the environment, and the community, while accelerating our efforts in diversity and inclusion, all of which we believe contribute to long-term sustainable shareholder value. These issues are all interrelated. For example, environmental issues are central to human health. To that end, I am incredibly proud of our recently launched 20-year, $250 million Healthy Climate, Healthy Lives initiative. This includes a goal to eliminate our fossil fuel emissions by 2040 and to be a catalyst for positive change by advancing the science around how fossil fuel impact human health and taking action to promote climate and health equity. Finally, I would to thank our employees around the world, who are dedicated to making a positive impact on patients life, including ensuring access to our therapies during these challenging times. With that, we will open the call for questions.