Table 2  Quality assessment of the included studies.

Author (year)	Random Sequence Generation	Allocation Concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other bias
Mansour (2011)	Yes	Yes	Unclear	Unclear	No	Unclear	Unclear
Hong (2014)	Yes	Yes	Yes	Yes	Yes	Yes	Unclear
Santibañez (2014)	Yes	Unclear	Yes	Yes	Yes	Unclear	Unclear
Zarei (2014)	Yes	Unclear	Yes	Yes	No	Unclear	Unclear
Aaleyasin (2015)	Yes	No	No	No	Yes	Yes	Yes
Wirleitner (2015)	Yes	Unclear	Yes	Yes	Yes	Unclear	Yes
Dehghani Firouzabadi (2016)	Yes	Yes	Unclear	Unclear	Yes	Unclear	Unclear
Hossini (2016)	Yes	Yes	Yes	Yes	Yes	Unclear	Unclear
Huang (2016)	Yes	Unclear	Yes	Unclear	Yes	Unclear	Unclear
Navali (2016)	Yes	Yes	Yes	Yes	Yes	Unclear	Unclear
Mostajeran (2017)	Yes	Unclear	Yes	Unclear	Yes	Unclear	Unclear
Hafezi (2018)	Yes	Unclear	Yes	Unclear	No	Unclear	Unclear