Table 1.

RoB2: Risk-of-Bias Assessment

No.	Author	Randomization process	Derivations from the intended intervention	Missing outcome data	Measurement of the outcome	Selection of the reported results	Overall risk of bias
1	Abohabib	+	+	+	+	+	Low RoB
2	Bozkaya	+	+	+	+	+	Low RoB
3	Ekizer	+	+	+	+	+	Low RoB
4	Elsyad	+	?	+	+	+	Some concern
5	Garcia	+	+	+	+	+	Low RoB
6	Gokmenoglu	?	?	+	+	+	Low RoB
7	Kinalski	+	+	+	+	+	Low RoB
8	Lobato	+	+	+	+	+	Low RoB
9	Matys (2019)	+	+	+	+	+	Low RoB
10	Matys (2020)	+	+	+	+	+	Low RoB
11	Memarian	+	?	+	+	+	Some concern
12	Osman	+	+	+	-	+	High RoB
13	Palled	+	+	+	+	+	Low RoB
14	Sleem	?	-	+	+	?	High RoB
15	Torkzaban	+	+	+	+	+	Low RoB

(+) is the symbol of “low risk of bias.” (?) is the symbol for “some concern.” (-) is the symbol for “high risk of bias.”