WHO progression scale ≤ 5;Cumulative incidence of successful tracheal extubation (defined as duration extubation > 48h) or withdrawal of NIV or high flow (for > 48h), at day 14;Decrease of at least one point in WHO progression scale score;Survival without needs of ventilator utilization at day 14

WHO progression scale ≤ 5;Cumulative incidence of successful tracheal extubation (defined as duration extubation > 48h) or withdrawal of NIV or high flow (for > 48h), at day 14;Decrease of at least one point in WHO progression scale score;Survival without needs of ventilator utilization at day 14