Thank you, Rob. I'm pleased to report on another quarter of strong financial execution. I'll review the key financial results from the first quarter and then review our full year 2023 guidance and provide a few closing thoughts. Please note that all financial comparisons are versus the prior year period unless otherwise noted. Please also refer to our press release and Form 10-Q for detailed financial information. Starting with revenue, total revenues for the first quarter of 2023 or $47 million driven by HEPLISAV-B net products revenue of $44 million. Compared to the first quarter of last year HEPLISAV-B net product revenue represented an increase of 109%. We are excited about the continued growth of the brand, which is tracking at the higher end of our revenue expectations for the full year. We're also pleased with the continued trend in the margin profile for HEPLISAV-B with gross margins expected to exceed 70% for the year, despite certain onetime charges related to improvement projects at the Germany manufacturing facility in first quarter. Other revenue was $4 million for the first quarter, representing revenue related to the plague vaccine program in collaboration with and fully funded by the U.S. Department of Defense. We continue to be pleased with the progress of this program and the collaboration with the DoD. Turning to CpG 1018 adjuvant supply for COVID 19 vaccine. As expected, we did not record any COVID-19 related revenue this quarter. As we have previously indicated, we believe our customers have sufficient adjuvant stockpile to fulfill their near term demand, translating to minimal to as little as zero COVID-19 related adjuvant sales for Dynavax in 2023. As we progress throughout the year, and as we gain clarity around the endemic demand of COVID-19 vaccines for our customers, we will provide updates around any potential future commercial supply agreements for 2024 and beyond. We continue to collect amounts outstanding from our COVID-19 CpG 1018 adjuvant supply customers. As a reminder, early in the pandemic CEPI provided funding to Dynavax in the form of a fully forgivable loan to support CpG 1018 adjuvant supply to CEPI partners, including Biological E, who has developed and supplied its COVID-19 vaccine COBREVAX to the Government of India. During the first quarter, the credit profile for Biological E was negatively impacted as its cash collections from the Government of India for COBREVAX have been significantly reduced and delayed. Accordingly, in April 2023, we entered into agreements with COBREVAX and CEPI to resolve the remaining amounts due from Biological E and to fully forgive the corresponding CEPI advance payments. This resolution resulted in approximately $12 million in bad debt expense during the first quarter, reflecting uncollectible amounts. And we've only $1 million outstanding as of today from Biological E, which we expect to collect later this year. Overall, we continue to be very proud of the way we've navigated such a complex and dynamic environment and our meaningful role in the global response to the pandemic, delivering CpG 1018 adjuvant for nearly 1 billion COVID-19 vaccine doses across all five of our commercial supply partnerships. Now turning to our research and development expenses for the quarter, fees increased to $14 million, compared to $11 million in the prior period. This increase was driven by continued advancement in our clinical pipeline programs as Rob mentioned. Selling general and administrative expenses for the first quarter increased to $37 million, compared to $32 million in the prior period. The increase was primarily driven by higher personnel related costs, and an overall increase in targeted marketing efforts to drive HEPLISAV-B market share and drive market expansion and key segments that we believe will disproportionately benefit HEPLISAV-B. Now turning to net loss, we recorded GAAP net loss of $24 million or $0.19 per share basic and diluted in Q1. This is compared to GAAP net income of $33 million, or $0.26 per share basic and $0.22 per share diluted for the prior year period. Turning to the balance sheet. We ended the first quarter with cash cash equivalents and marketable securities of approximately $652 million an increase compared to our year-end balance of $624 million. Based on our current operating plans, we expect to finish 2023 with positive free cash flow for the year. We continue to believe that this level of capital is sufficient to support our core business, enabling us to drive sustainable growth in HEPLISAV-B to capture a majority market share and bring our R&D portfolio of vaccine candidates forward without needing to return to the capital markets. We are also pleased to reaffirm our full year 2023 financial guidance, which includes the following expectations: HEPLISAV-B net product revenue to be between $165 million to $185 million; research and development expenses of between $55 million to $70 million and selling general and administrative expenses to be between $135 million to $155 million. In closing, we continue to execute on our core priorities across the entire organization. We are focused on strong operational and financial performance, as well as being extremely thoughtful in how we allocate our capital to accelerate growth. Our strong capital position and commercial execution has provided us with strategic flexibility to identify and pursue external opportunities to complement our organic growth as we strive to deliver long-term value to our shareholders. We are excited about our progress to date. And we look forward to continuing to deliver on our goals for 2023. Thank you everyone for your attention today. Operator, we would now like to open the Q&A portion of today's call.