Table 4.

Risk of bias assessment (ROB-2).

Author/Year	D1	D2	D3	D4	D5	Overall
KahodomMohson et al. 2021 (16)	H	H	L	L	Some concerns	H
Mehrzadi et al. 2018 (15)	L	L	L	Some concerns	L	Some concerns
Khalili et al. 2017 (14)	L	L	L	Some concerns	L	Some concerns
Ahangarpour et al. 2014 (12)	L	Some concerns	L	Some concerns	Some concerns	Some concerns
Azadmehr et al. 2014 (13)	L	Some concern	L	Some concerns	L	Some concerns

✓D1: Bias arising from the randomization process.

✓D2: Bias due to deviations from intended interventions.

✓D3: Bias due to missing outcome data.

✓D4: Bias in measurement of the outcome.

✓D5: Bias in selection of the reported result.

✓L, low risk of bias; H, high risk of bias.