Table 3.

Risk of bias assessment for RCTs according to the Cochrane Risk of Bias Tool.

First Author (year)	Random Sequence Generation (Selection Bias)	Allocation Concealment (Selection Bias)	Blinding of Participants and Personnel (Performance Bias)	Blinding of Outcome Assessment (Detection Bias)	Incomplete Outcome Data (Attrition Bias)	Selective Reporting (Reporting Bias)	Other Bias
Balius et al. (2016)	+	-	-	-	?	-	-
Juhasz et al. (2018)	?	?	?	?	+	+	+
Mavrogenis et al. (2004)	+	+	+	+	-	+	?
Notarnicola et al. (2012)	-	?	+	?	-	+	-
Praet et al. (2019)	+	+	+	+	+	+	+
Sandford et al. (2018)	+	+	+	+	+	+	+

-, high risk of bias; +, low risk of bias; ?, unclear risk of bias, as paper contained insufficient information to permit judgement.