TABLE 2.

Quality assessment (A summary of the risk of bias according to Cochrane criteria).

References	Random sequence generation	Allocation concealment	Selective reporting	Other sources of bias	Blinding (participants and personnel)	Blinding (outcome assessment)	Incomplete outcome data	General risk of bias	Quality
Modaghegh et al. (40)	L	H	H	L	L	U	L	M	Fair
Gout et al. (41)	L	L	H	H	L	U	L	M	Fair
Mansoori et al. (42)	L	H	H	H	L	U	L	H	Bad
Mohamadpour et al. (43)	L	L	H	H	L	U	H	H	Bad
Fadai et al. (45)	L	L	H	H	L	L	L	M	Fair
Azimi et al. (44)	L	H	H	L	H	H	L	H	Bad
Mousavi et al. (46)	L	H	H	H	L	U	L	H	Bad
Nikbakht-Jam et al. (47)	L	L	H	H	L	U	L	M	Fair
Azimi et al. (48)	L	H	H	H	H	H	L	H	Bad
Javandoost et al. (51)	L	L	H	H	L	U	L	M	Fair
Abedimanesh et al. (49)	L	H	H	L	L	U	L	M	Fair
Kermani et al. (52)	L	H	H	H	L	U	L	H	Bad
Kermani et al. (53)	L	H	H	H	L	U	L	H	Bad
Jafarnia et al. (50)	L	L	H	L	L	U	L	L	Good
Milajerdi et al. (17)	L	L	H	L	L	L	L	L	Good
Sepahi et al. (54)	L	L	H	H	L	U	L	M	Fair
Zilaee et al. (55)	L	H	H	H	L	U	L	H	Bad
Moravej Aleali et al. (61)	L	L	H	L	L	U	L	L	Good
Ghaderi et al. (58)	L	L	H	H	L	U	L	M	Fair
Ebrahimi et al. (56)	L	L	H	L	L	U	L	L	Good
Karimi-Nazari et al. (60)	L	L	H	L	L	U	L	L	Good
Shahbazian et al. (62)	L	L	H	L	L	U	L	L	Good
Zilaee et al. (63)	L	L	H	L	L	U	L	L	Good
Ghiasian et al. (59)	L	H	H	H	L	U	L	H	Bad
Ebrahimi et al. (57)	L	L	H	L	L	U	L	L	Good
Behrouz et al. (64)	L	L	H	H	L	U	L	M	Fair
Mobasseri et al. (66)	L	L	H	H	L	U	L	M	Fair
Parsi et al. (67)	L	L	H	H	L	U	L	M	Fair
Hamidi et al. (65)	L	L	H	H	L	U	L	M	Fair
Kavianipour et al. (68)	L	L	H	L	L	U	L	L	Good
Tajaddini et al. (15)	L	L	H	L	L	U	L	L	Good
Tahvilian et al. (69)	L	L	H	L	L	U	L	L	Good

H, high risk of bias; L, low risk of bias; U, unclear risk of bias.

The Cochrane collaboration tool was used to assess the quality of studies.

Bad > 2 high risks; Good < 2 high risk; Fair = 2 high risk.