The primary endpoint is treatment failure rate, where treatment failure is defined as use of assisted ventilation or death. For the purpose of this study assisted ventilation is defined as noninvasive ventilation (eg, continuous positive airway pressure [CPAP] ventilation), invasive mechanical ventilation, or ECMO machine

The primary endpoint is treatment failure rate, where treatment failure is defined as use of assisted ventilation or death. For the purpose of this study assisted ventilation is defined as noninvasive ventilation (eg, continuous positive airway pressure [CPAP] ventilation), invasive mechanical ventilation, or ECMO machine