ARDS = acute respiratory distress syndrome; CI, confidence interval; COVID-19, coronavirus disease 2019; CT, computed tomography; EOT, end of treatment; HR, hazard ratio; Ig, immunoglobulin; IL-1, interleukin 1; IQR, interquartile range; ITT, intent to treat; mITT, modified intent to treat; Pao2/Fio2, of arterial oxygen partial pressure to fractional inspired oxygen; RCT, randomized controlled trial; RT-PCR, real-time PCR; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; WHO, World Health Organization.