Endo-tracheal Intubation/Invasive Mechanical Ventilation (IMV);Lung Function Assessment - Proportion of Patients With Stable PaO2 Without Increasing FiO2;Lung Function Assessment - Proportion of the Patients With Stable or Improved SpO2 Without Increasing FiO2;Mean Change From Baseline D-Dimer;Mean Change From Baseline in CRP (C-reactive Protein);Mean Change From Baseline in Ferritin;Mean Change From Baseline in LDH;One-month Mortality Rate Between the Two Arms;Reduction in Proportion of Patients-High Flow Nasal Oxygen;Reduction in Proportion of Patients- Invasive Mechanical Ventilation;Reduction in Proportion of Patients on Non-invasive Ventilation

Endo-tracheal Intubation/Invasive Mechanical Ventilation (IMV);Lung Function Assessment - Proportion of Patients With Stable PaO2 Without Increasing FiO2;Lung Function Assessment - Proportion of the Patients With Stable or Improved SpO2 Without Increasing FiO2;Mean Change From Baseline D-Dimer;Mean Change From Baseline in CRP (C-reactive Protein);Mean Change From Baseline in Ferritin;Mean Change From Baseline in LDH;One-month Mortality Rate Between the Two Arms;Reduction in Proportion of Patients-High Flow Nasal Oxygen;Reduction in Proportion of Patients- Invasive Mechanical Ventilation;Reduction in Proportion of Patients on Non-invasive Ventilation

One-month mortality rate between the two arms

One-month mortality rate between the two arms