Table 3.

Cochrane risk of bias table for included randomised controlled trials.

	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
Bergholdt et al, 201322	+	-	-	+	?	-	?
Grunfeld et al, 201123	+	+	+	+	+	+	+
Johnson et al, 201524	+	?	-	?	+	+	+
King et al, 200925	+	+	+	?	-	?	+
Wagner et al, 201426	+	+	-	+	+	-	+
Wulff et al, 201327	+	+	-	+	+	-	+