Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "A blocked randomization method stratified by the neonatal intensive care unit size was used to assign infants to either the control or oral VA group"
Allocation concealment (selection bias)	Low risk	Quote: "solutions, which were only labelled with the study site and infant number"
Blinding of participants and personnel (performance bias)	Low risk	Quote: "The medical and nursing teams caring for the infants were thus completely unaware of the content of the solutions"
Blinding of outcome assessment (detection bias)	Low risk	Quote: "The medical and nursing teams caring for the infants were thus completely unaware of the content of the solutions, which were only labelled with the study site and infant number"
Incomplete outcome data (attrition bias)	Low risk	No loss to follow up was noted
Selective reporting (reporting bias)	Low risk	Authors seem to report all the relevant outcomes
Other bias	Low risk	No other risk of bias was noted