Table 1.

AMSTAR-2 16-point checklist of risk-of-bias assessment in studies selected for the systematic review

Studies selected	Question and inclusion	Protocol	Study design	Comprehensive search	Study selection	Data extraction	Excluded studies’ justification	Included study details
Abed et al. 2011[19]	Yes	Yes	Yes	Yes	Yes	No	No	No
Ashish et al. 2017[20]	Yes	Yes	Yes	Yes	Yes	No	No	No
Hovell et al. 2018[21]	Yes	Yes	Yes	Yes	Yes	No	No	No
Ibraheem et al. 2021[22]	Yes	Yes	Yes	Yes	Yes	No	No	No
Maheshwari et al. 2017[23]	Yes	Yes	Yes	Yes	Yes	No	No	No
Mehta et al. 2020[24]	Yes	Yes	Yes	Yes	Yes	No	No	No
Bose et al. 2021[25]	Yes	Yes	Yes	Yes	Yes	No	No	No
Settineri et al. 2016[26]	Yes	Yes	Yes	Yes	Yes	No	No	No
Shirazi et al. 2011[27]	Yes	Yes	Yes	Yes	Yes	No	No	No
Singh et al. 2017[28]	Yes	Yes	Yes	Yes	Yes	No	No	No
Studies selected	Risk of bias	Funding sources	Statistical methods	Risk of bias in meta-analysis	Risk of bias in individual studies	Explanation of heterogeneity	Publication bias	Conflict of interest
Abed et al. 2011[19]	Yes	N/A	Yes	Yes	Yes	Yes	Yes	Yes
Ashish et al. 2017[20]	Yes	N/A	Yes	Yes	Yes	Yes	Yes	Yes
Hovell et al. 2018[21]	Yes	N/A	Yes	N/A	Yes	Yes	Yes	Yes
Ibraheem et al. 2021[22]	Yes	N/A	Yes	Yes	Yes	Yes	Yes	Yes
Maheshwari et al. 2017[23]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Mehta et al. 2020[24]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Bose et al. 2021[25]	Yes	N/A	Yes	Yes	Yes	Yes	Yes	Yes
Settineri et al. 2016[26]	Yes	N/A	Yes	Yes	Yes	Yes	Yes	Yes
Shirazi et al. 2011[27]	Yes	N/A	Yes	N/A	Yes	Yes	Yes	Yes
Singh et al. 2017[28]	Yes	N/A	Yes		Yes	Yes	Yes	Yes