Table 5. Combined risk of bias assessment.

Authors, year	Study design	D1 randomization process	Bias due to confounding	Bias in selection	Bias in classification of interventions	D2 bias due to deviation from intervention	D3 bias due to missing data	D4 bias in outcome measurement	D5 selective reporting	Overall
Narenchandra 2022 (11)	RCT	Low	NA	NA	NA	Low	Low	Low	Low	Some concerns
Jabłoński 2018 (18)	RCT	Low	NA	NA	NA	Low	Low	Low	Low	Some concerns
Cobanoglu 2009 (12)	Prospective study	NA	Serious	Serious	Low	Low	Low	Low	Low	Serious