Table 3.

Cochrane Risk of Bias assessment of the included studies.

	Selection Bias		Performance Bias	Detection Bias	Attrition Bias	Reporting Bias	Other Bias
Author and Year	Random Sequence Generation	Concealment of Randomization Sequence	Blinding of Participants	Blinding of Outcomes Assessors	Incomplete Outcome Data	Selective Reporting	Other, Ideally Prespecified
Avcil, E. et al. (2020) [76]	-	+	+	?	-	-	-
Cuesta-Gómez, A. et al. (2020) [77]	-	+	+	-	-	-	-
Fernández-González, P. et al. (2019) [78]	-	+	+	+	-	-	-
Wang, Z. et al. (2017) [79]	-	+	+	-	-	-	-
Ögün, M.N. et al. (2019) [80]	-	+	+	-	-	-	-

Abbreviations: “+” = high risk of bias, “-” = low risk of bias, “?” = inadequate data for the evaluation.