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
Pistilli et al. [23] Yes Yes Yes Yes Yes Low
Esposito et al. [24] Yes Yes Yes Yes Yes Low
Felice et al. [25] Yes Yes Yes Yes Yes Low
Bernardi al. [26] Yes Yes No Yes Yes Moderate
Bolle et al. [27] Yes Yes Yes Yes Yes Low
Gastaldi et al. [28] Yes Yes Yes Yes Yes Low