Operator Good morning, and welcome to the United Therapeutics Corporation Fourth Quarter 2020 Earnings Call. My name is Kenzie, and I will be your conference operator today. [Operator Instructions] I will now turn the conference call over to Mr. Dewey Steadman, Head of Investor Relations at United Therapeutics. Dewey Steadman -- Head of Investor Relations Good morning. It's my pleasure to welcome you to the United Therapeutics Corporation Fourth Quarter 2020 Earnings Call. Accompanying me on today's call are Dr. Martine Rothblatt, our Chairman and Chief Executive Officer; Mr. Michael Benkowi...