Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "using random selection by lottery"
Allocation concealment (selection bias)	High risk	Quote: "Intervention was instructed by the researcher and conducted by nursing staff of NICU"
Blinding of participants and personnel (performance bias)	Low risk	Less likely that neonates were aware of the intervention
Blinding of outcome assessment (detection bias)	Unclear risk	No clear information was provided on who made the assessment for clinical outcomes
Incomplete outcome data (attrition bias)	Low risk	Minimal loss to follow up
Selective reporting (reporting bias)	Low risk	Authors seem to report all the outcomes irrespective of their statistical significance
Other bias	Low risk	No other risk of bias was noted