inclusion criteria: * hospitalized with covid-19 pneumonia confirmed per who criteria (including a positive pcr of any specimen; e.g., respiratory, blood, urine, stool, other bodily fluid) and evidenced by chest x-ray or ct scan * peripheral capillary oxygen saturation (spo2) ≤93% (on room air or supplemental oxygen) or partial pressure of oxygen (pao2)/fraction of inspired oxygen (fio2) ≤300 millimetres of mercury (mmhg) or requiring supplemental oxygen to maintain spo2 \>93% or requirement for supplemental oxygen to maintain spo2 at an acceptable level per local standard of care

inclusion criteria: * hospitalized with covid-19 pneumonia confirmed per who criteria (including a positive pcr of any specimen; e.g., respiratory, blood, urine, stool, other bodily fluid) and evidenced by chest x-ray or ct scan * peripheral capillary oxygen saturation (spo2) ≤93% (on room air or supplemental oxygen) or partial pressure of oxygen (pao2)/fraction of inspired oxygen (fio2) ≤300 millimetres of mercury (mmhg) or requiring supplemental oxygen to maintain spo2 \>93% or requirement for supplemental oxygen to maintain spo2 at an acceptable level per local standard of care

inclusion criteria: - hospitalized with covid-19 pneumonia confirmed per who criteria (including a positive pcr of any specimen; e.g., respiratory, blood, urine, stool, other bodily fluid) and evidenced by chest x-ray or ct scan - peripheral capillary oxygen saturation (spo2) ≤93% (on room air or supplemental oxygen) or partial pressure of oxygen (pao2)/fraction of inspired oxygen (fio2) ≤300 millimetres of mercury (mmhg) or requiring supplemental oxygen to maintain spo2 >93% or requirement for supplemental oxygen to maintain spo2 at an acceptable level per local standard of care

inclusion criteria: - hospitalized with covid-19 pneumonia confirmed per who criteria (including a positive pcr of any specimen; e.g., respiratory, blood, urine, stool, other bodily fluid) and evidenced by chest x-ray or ct scan - peripheral capillary oxygen saturation (spo2) ≤93% (on room air or supplemental oxygen) or partial pressure of oxygen (pao2)/fraction of inspired oxygen (fio2) ≤300 millimetres of mercury (mmhg) or requiring supplemental oxygen to maintain spo2 >93% or requirement for supplemental oxygen to maintain spo2 at an acceptable level per local standard of care