Table 2.

Risk of bias-2 scores of the included studies.

First Author	Randomization Process	Deviations from Intended Interventions	Missing Outcome Data	Measurement of Outcomes	Selection of Reported Results	Overall
Brown et al. [30]	+	?	+	+	?	?
Dall et al. [31]	–	?	+	–	+	–
Killey and Watt [32]	–	?	–	+	?	–
McGowan et al. [33]	+	?	–	+	?	–

+, low risk; ?, some concerns; – high risk.