Table 5. Characteristics of the clinical trials published.

Study	Sample size calculation	Described as randomized	Randomization clarified	Described as double-blinded	Blinding clarified
Souza Júnior et al.3	No	Yes	No	Yes	No
Bertolla et al.4	No	Yes	No	Yes	No
Angeli et al.5	No	Yes	No	Yes	No
Trevisan and Burini6	No	No	-	No	-
Gama et al.7	No	Yes	No	No	-
Silva et al.8	No	No	-	No	-
Nascimento et al.9	No	Yes	Yes, but was inadequate	No	-
Benegas et al.10	No	Yes	No	No	-