Table 4.

Summary assessments of risk of bias of the studies included with the Cochrane Collaboration’s tool.

	Generation of Random Sequences (Selection Bias)	Allocation Concealment (Selection Bias)	Participant and Staff Blinding (Performance Bias)	Blinding of the Outcome Assessment (Detection Bias)	Incomplete Outcome Data (Attrition Bias)	Selective Reporting (Reporting Bias)
Ide et al. (2016)	+	?	?	?	+	+
Mastroiacovo et al. (2015)	?	?	+	?	+	+
Brickman et al. (2014)	?	?	−	?	+	+
Desideri et al. (2012)	?	+	+	+	+	+
Krikorian et al. (2012)	?	?	+	?	?	?
Lamport et al. (2015)	+	+	+	+	?	?
Witte et al. (2014)	?	?	+	?	+	?
Pase et al. (2013)	+	+	+	+	?	?
Anton et al. (2018)	+	?	?	?	?	?
Moran et al. (2018)	+	?	+	+	+	+
Lee et al. (2017)	?	?	+	+	+	?
Wong et al. (2016)	?	+	+	+	+	+
Evans et al. (2017)	−	+	+	+	+	+
Kobe et al. (2017)	+	+	?	?	+	?

(+) Low risk of bias (?) Risk of unclear bias (−) High risk of bias.