Table 1.

Risk of bias assessment for the randomized trials using the Cochrane RoB 2 tool

Study	Bias arising from the randomization process	Bias due to deviations from intended intervention	Bias due to missing outcome data	Bias in measurement of the outcome	Bias in selection of the reported result	Overall
Lennon (1995) [9]
Candela (1997) [19]
Lee (2005) [20]
Joshi (2005) [14]
Mendez-Probst (2012) [21]
El-Nahas (2018) [22]
Wiseman (2020) [23]

The symbol indicates a low risk of bias, indicates an unclear risk of bias, and indicates a high risk of bias.