Table 2.

Risk of bias assessment.

Study	Random Sequence Generation	Allocation Concealment	Blinding of Participants and Personnel	Blinding of Outcome Assessment	Incomplete Outcome Data	Selective Reporting	Other Sources of Bias
2016 Salar [24]	L	L	L	L	L	L	U
2015 Negele [25]	H	L	L	L	L	L	U
2021 Welma [27]	L	L	H	L	L	L	U
2015 Wang [28]	U	U	H	L	L	L	U
2005 Pieterse [26]	U	H	H	L	L	L	U
2008 Griel [27]	U	U	U	L	L	L	U
2007 Mercanlıgil [23]	U	U	H	L	L	L	U

L = low; H = high; U = unclear.