To evaluate the time to recovery as defined by no longer requiring oxygen support or hospital discharge; whichever occurs first ;To evaluate the change in the ratio of peripheral hemoglobin oxygen saturation to fraction of inspired oxygen (SpO2/FiO2) from baseline to Day 10 or hospital discharge; whichever occurs first

To evaluate the time to recovery as defined by no longer requiring oxygen support or hospital discharge; whichever occurs first ;To evaluate the change in the ratio of peripheral hemoglobin oxygen saturation to fraction of inspired oxygen (SpO2/FiO2) from baseline to Day 10 or hospital discharge; whichever occurs first