Table 3.

Assessment of the Risk of Bias in the 6 Included Studies

Study	Randomization process	Deviations from intended interventions	Missing outcome data	Measurement of the outcome	Selection of the reported result	Overall
Toots et al. (29,31,32); Boström et al. (33)	1	1	1	1	1	1
Brett et al. (34,35)	1	2	2	2	1	3
Cancela et al. (30)	1	1	2	2	2	3
Littbrand et al. (36); Conradsson et al. (37)	1	1	1	1	1	1
Telenius et al. (28)	1	1	2	1	1	2
Venturelli et al. (27)	1	2	1	3	3	3

Notes: 1 = low risk of bias; 2 = some concerns; 3 = high risk of bias.