Table 4.

Quality assessment of the included studies for potential risk of bias

Study	Random selection in the population	Definition of inclusion and exclusion criteria	Report of losses to follow-up	Validated measurements	Statistical analysis	Risk of bias
Altiparmak et al. [18]	No	Yes	No	Yes	Yes	High
González-García et al. [21]	No	Yes	No	Yes	No	High
Garcez-Filho et al. [22]	No	Yes	Yes	Yes	Yes	Moderate
Santagata et al. [23]	No	Yes	No	Yes	No	High
Albanese et al. [24]	No	Yes	No	Yes	Yes	High

Each study was categorized as low, moderate or high risk of bias.