Table 2.

A summary of the risk of bias assessment of the included studies

Study	Sequence generation	Allocation concealment	Blinding of participants	Blinding of outcome	Incomplete outcome data	Selective outcome reporting	Other potential threats to validity	Estimated risk of bias within study
Anauate-Netto et al.	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk
Dehghani et al.	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk
Abdullah et al.	Low risk	High risk	Low risk	High risk	Low risk	Low risk	Low risk	High risk
Dodwad and Kukreja	Low risk	Low risk	Low risk	High risk	Low risk	Low risk	Low risk	High risk
Savita et al.	Low risk	Low risk	Unclear risk	Unclear risk	Unclear risk	Low risk	Low risk	Unclear risk
Santiago et al.	High risk	High risk	High risk	High risk	Unclear risk	Low risk	High risk	High risk
Murray et al.	Low risk	Low risk	Low risk	Unclear risk	Low risk	Low risk	Low risk	High risk
Porwal et al.	Low risk	Low risk	Unclear risk	High risk	Low risk	Low risk	Low risk	High risk
Krishna et al.	Low risk	Low risk	Unclear risk	High risk	Low risk	Low risk	Low risk	High risk