Table 2.

Risk of bias table for the RCTs.

Author, year	Selection bias		Performance bias	Detection bias		Attrition bias		Reporting bias
	Random sequence generation	Allocation concealment	Blinding of participants	Patient-reported outcomes	All-cause mortality	Short-term	Long-term	Selective reporting
Farrehi et al., 2016 [21]	+	+	+	+	?	?	?	+
Gutman et al., 2016 [23]	?	?	?	?	?	+	?	+
Leland et al., 2016 [26]	+	+	+	?	?	+	+	+

Note. Categories for risk of bias are as follows: +: low risk; ?: unclear risk; −: high risk.