Article	Aydogmus et al.	Paci et al.	Wendling-Keim et al.	Balakumar et al.
Pre-intervention
Bias due to confounding	Moderate risk	Moderate risk	Moderate risk	Serious risk
Bias in selection of participants into the study	Low risk	Low risk	Low risk	Low risk
At intervention
Bias in classification of interventions	Serious risk	Moderate risk	Serious risk	Serious risk
Post-intervention
Bias due to deviations from intended interventions	Low risk	Low risk	Low risk	Low risk
Bias due to missing data	Low risk	Low risk	Low risk	Low risk
Bias in measurement of outcomes	Moderate risk	Moderate risk	Low risk	Moderate risk
Bias in selection of the reported result	Low risk	Low risk	Low risk	Low risk
Total risk of bias score	Serious risk	Moderate risk	Serious risk	Serious risk