Table 2. Risk of bias of included studies and Jadad scores.

Study and reference	Randomization	Double blind	Description of losses	Appropriate randomization	Appropriate double blind	Jadad classification
Sjögren et al.13	Yes	No	Yes	No	No	Low quality
Sjögren et al.14	Yes	No	Yes	No	No	Low quality
Andersen et al.15	Yes	No	Yes	Yes	No	High quality
Andersen et al.16	Yes	No	Yes	Yes	No	High quality
Pedersen et al.17	Yes	No	Yes	Yes	No	High quality
Andersen et al.18	Yes	No	Yes	Yes	No	High quality
Jay et al.19	Yes	No	Yes	Yes	No	High quality
Zebis et al.20	Yes	No	Yes	Yes	No	High quality
Macedo et al.21	No	No	Yes	No	No	Low quality
Marangoni22	Yes	No	No	No	No	Low quality