Silveira 2015.

Methods	Randomized controlled trial
Participants	Preterm infants at less than 37 weeks and weighing less than 2500 grams; with RDS and early use of noninvasive respiratory support or post extubation
Interventions	NIPPV (unspecified) vs NCPAP
Outcomes	Failure of allocated mode within 48 hours
Notes	Contact with study authors initiated to extract infants who were treated early for possible inclusion in a future update of this review

BPD: bronchopulmonary dysplasia.
 DuoPAP: Duo positive airway pressure.
 NCPAP: nasal continuous positive airway pressure.
 NIPPV: nasal intermittent positive pressure ventilation.
 NRDS: neonatal respiratory distress syndrome.
 OI: oxygenation index.
 PaCO2: partial pressure of carbon dioxide.
 PS: pulmonary surfactant.
 PSANZ: Perinatal Society of Australia and New Zealand.
 RDS: respiratory distress syndrome.
 RI: respiratory index.