Table 2.

Summary of the risk of bias of the included studies.

Study	Risk of Bias
	A	B	C	D	E	F	G	Overall
GRAUNAITE et al. 2018 [31]	+	+	?	+	+	+	+	?
PAZ et al. 2018 [28]	?	?	?	+	+	+	-	-
ATES et al. 2019 [35]	+	?		+	+	+	+	?
FERREIRA et al. 2019 [33]	+	+	+	+	+	+	?	?
FONSECA et al. 2019 [32]	+	+	+			+	+	+
NABI et al. 2019 [34]	?	?	+	+	+	+	?	?
SHARMA et al. 2019 [36]	?	?	?	?	+	+	?	?
TAN et al. 2020 [30]	+	+	+	+	+	+	+	+
YU 2020 [29]	+	+	?	?	?	+	?	?

“+”: low risk of bias, “?”: unclear risk of bias,“-”: high risk of bias. (A) Random sequence generation (selection bias). (B) Allocation concealment (selection bias). (C) Blinding of participants and personnel (performance bias). (D) Blinding of outcome assessment (detection bias). (E) Incomplete outcome data (attrition bias). (F) Selective reporting (reporting bias). (G) Other bias.