Created at	Source	Raw Value	Validated value
Dec. 16, 2020, 10:02 a.m.	usa	inclusion criteria: - confirmed covid-19 infection using pcr - acute respiratory failure ( 200 <pao2/fio2 <300) and respiratory rate < 30 atti/min - o2 therapy initiated <72 hrs - informed consent	inclusion criteria: - confirmed covid-19 infection using pcr - acute respiratory failure ( 200 <pao2/fio2 <300) and respiratory rate < 30 atti/min - o2 therapy initiated <72 hrs - informed consent