Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "The newborns were randomized into two groups by a random‐generated (computer‐generated), predetermined number table"
Allocation concealment (selection bias)	Low risk	Quote: "All doctors, nurses, laboratory staff, and parents are blind to the randomized allocation"
		Less likely that allocation was revealed
Blinding of participants and personnel (performance bias)	Low risk	Quote: "All doctors, nurses, laboratory staff, and parents are blind to the randomized allocation"
Blinding of outcome assessment (detection bias)	Low risk	Quote: "All doctors, nurses, laboratory staff, and parents are blind to the randomized allocation"
Incomplete outcome data (attrition bias)	Low risk	Minimal loss to follow up
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