Fig. 1From: Investigational medications in 9,638 hospitalized patients with severe COVID-19: lessons from the “fail-and-learn” strategy during the first two waves of the pandemic in 2020Patient selection flowchartLegend: *Exclusion criteria listed in the methods sectionAbbreviations: COVID, novel coronavirus disease; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; PCR, polymerase chain reactionBack to article page