Table 7. Risk of bias of the non-randomized controlled trials.

ROBINS-I Domain	(Alfredson et al., 1998)	(Gómez et al., 2023)
Bias due to confounding	Serious	Serious
Bias in selection of participants into the study	Moderate	Moderate
Bias in classification of interventions	Low	Low
Bias due to deviations from intended interventions	Moderate	Moderate
Bias due to missing data	Low	Low
Bias in measurement of outcomes	Serious	Moderate
Bias in selection of the reported result	Moderate	Moderate