Table 3.

Assessment of risk of bias of non randomized studies according to the ROBINS-I tool.

References	Preintervention		At intervention	Post intervention				Overall risk of bias
	Bias due to confounding	Bias in selection of participants into the study	Bias in classification of interventions	Bias due to deviations from interventions	Bias due to missing data	Bias in measurement of outcomes	Bias in selection of the reported result	Low/moderate/serious/critical
Almog et al.75	Low	Moderate	Moderate	Moderate	Low	Moderate	Low	Moderate
Berker et al.31	Low	Low	Low	Moderate	Low	Low	Low	Moderate
Fang et al.144	Serious	Moderate	Moderate	Low	Low	Moderate	Low	Serious
Greco et al.145	Moderate	Moderate	Low	Moderate	Low	Low	Low	Moderate
He et al.12	Moderate	Moderate	Low	Low	Low	Low	Moderate	Moderate
Ho et al.21	Moderate	Low	Moderate	Low	Low	Moderate	Low	Moderate
Huang et al.48	Low	Low	Moderate	Low	Serious	Moderate	Moderate	Serious
Levran et al.18	Moderate	Moderate	Low	Low	Low	Moderate	Low	Moderate
Levran et al.150	Moderate	Low	Low	Low	Low	Moderate	Low	Moderate
Li et al.24	Moderate	Moderate	Moderate	Moderate	Low	Low	Low	Moderate
Matsumoto et al.152	Low	Low	Low	Low	Low	Low	Low	Low
Okitsu et al.157	Moderate	Moderate	Moderate	Low	Low	Low	Low	Moderate
Primi et al.158	Moderate	Moderate	Low	Low	Low	Low	Low	Moderate
Raziel et al.159	Moderate	Moderate	Moderate	Low	Low	Low	Low	Moderate
Sato et al.160	Low	Low	Low	Low	Low	Low	Low	Low
Shahrokh Tehraninejad et al.163	Moderate	Moderate	Low	Low	Low	Moderate	Low	Moderate
Yakin et al.167	Low	Low	Low	Low	Low	Low	Low	Low
Yoshioka et al.168	Low	Moderate	Moderate	Low	Low	Low	Low	Moderate