End-of-Part 1 interim analysis: Proportion of subjects with all cause mortality or with respiratory failure.;For the final analysis: Proportion of subjects with all cause mortality or respiratory failure.;For part-2 sample size interim analysis: Proportion of subjects with all cause mortality or with respiratory failure.

End-of-Part 1 interim analysis: Proportion of subjects with all cause mortality or with respiratory failure.;For the final analysis: Proportion of subjects with all cause mortality or respiratory failure.;For part-2 sample size interim analysis: Proportion of subjects with all cause mortality or with respiratory failure.