Table 3.

Methodological quality of included studies

Study ID	Random sequence generation (selection bias)	Allocation concealment (selection bias)	Blinding of participants and personnel (performance bias)
Kaya [34]	Random number table	Described blinding	All patients provided informed consent and were treated blindly
Kaygin [33]	Described randomization	Described blinding	All patients provided informed consent and were treated blindly
Fawzy [35]	Described randomization	Not described	All patients provided informed consent
Zhao [29]	Random number table	Opaque envelope	All patients provided informed consent
Kuralay [18]	Random number table	Not described	All patients provided informed consent
Asimakopoulos [32]	Described randomization	Not described	Not described
Ekim [20]	Described randomization	Not described	All patients provided informed consent
Farsak [19]	Random number table	Not described	All patients provided informed consent
Kongmalai [22]	Described randomization	Opaque envelope	Patients provided informed written consent individually
Arbatli [21]	Described randomization	Not described	Not described

Blinding of outcome assessment (detection bias)	Incomplete outcome data (attrition bias)	Selective reporting (reporting bias)	Other bias
Described blinding	Complete	No	No
Described blinding	Complete	No	No
Not described	Complete	No	No
Not described	Complete	No	No
Not described	Complete	No	No
Not described	Complete	No	No
Not described	Complete	No	No
Not described	Complete	No	No
Researchers analyzed data blinded	Complete	No	No
Not described	Complete	No	No