From the Introduction: "These Treatment Guidelines have been developed to inform clinicians how to care for patients with COVID-19 [coronavirus disease 2019]. Because clinical information about the optimal management of COVID-19 is evolving quickly, these Guidelines will be updated frequently as published data and other authoritative information become available. The recommendations in these Guidelines are based on scientific evidence and expert opinion."
National Institutes of Health
National Institutes of Health: https://www.nih.gov/