Table 2. Evidence Grading With Cochrane Risk of Bias Tool.

Author	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other sources of bias	Quality
Urena et al, 2017 [34]	Low	Low	Low	Low	Low	Unclear	Low	Good
Johansson et al, 2015 [36]	Low	Low	Low	Low	Low	Unclear	Low	Good
Padmanabhan et al, 2018 [35]	Low	Low	High	High	Low	Unclear	High	Poor
Garrido-Martin et al, 2012 [33]	Low	Low	Low	Unclear	High	Unclear	Low	Good
Spahn et al, 2019 [37]	Low	Low	Low	Low	Low	Unclear	Low	Good