Table 2.

ROBINS-I tool for critical appraisal of the risk of bias in all studies included.

ROBINS-I Tool
NON-RCTs	Change intervention bias	Classification of Intervention Bias	Measurement Outcome Bias	Missing Data Bias	Reporting Bias	Risk-of-Confounding Bias	Selection Bias	Overall Risk of Bias
L.Cannavò et al.[32]	unclear	low	low	low	low	low	low	low
Anderson et al.[16]	low	low	high	low	low	unclear	low	low
Bajpai et al.[21]	low	low	low	low	low	high	low	low
Aszódi et al.[33]	low	low	high	low	high	high	high	high
Fayad et al. [22]	low	low	low	low	high	high	high	low
Bosma et al.[30]	low	low	high	low	low	high	high	low
Boufettal et al. [35]	low	low	low	low	low	low	low	low
Cates et al. [24]	low	low	high	high	high	unclear	low	unclear
Seong Cho et al. [23]	low	low	low	low	low	unclear	low	low
Evrard et al. [31]	low	low	low	low	low	unclear	low	low
Fujiwara et al. [28]	low	low	low	low	low	unclear	low	low
Hodel et al. [29]	low	low	low	low	low	unclear	low	low
S. Shin et al. [34]	low	low	low	low	low	unclear	low	low
Malek et al. [25]	low	low	low	low	low	unclear	low	low
Meyer et al. [14]	low	low	high	high	low	unclear	high	high
Sakamoto et al. [26]	low	low	low	low	low	high	low	low
Wong et al. [27]	low	low	high	low	low	low	low	low