Excluding studies with high risk of bias
When studies with high risk of bias were excluded, there was no
difference in efficacy between any of the NRS modalities for the outcome
MV. The results were unchanged for other outcomes (E-Figure 10
and E-Figure 11).Excluding studies which had enrolled neonates who had already
received surfactantThe results were unchanged after excluding trials that had enrolled
neonate who had already received surfactant prior to randomisation