Table 2.

Risk of bias assessment

Study	Concealment of allocation	Adequate sequence generation	Blinding of outcome assessors	Incomplete outcome data addressed	Free of selective reporting	Free of other bias	Overall risk of bias in study
Alphonso et al.13	Yes	Yes	Unclear	No	Unclear	Yes	High
Ayed14	Unclear	Unclear	Unclear	Yes	Yes	Yes	Unclear
Brunelli et al.15	Unclear	Unclear	Unclear	Yes	Yes	Yes	Unclear
Cerfolio et al.1	Unclear	Unclear	Unclear	Yes	Unclear	Yes	Unclear
Daneshvar et al.16	Unclear	Unclear	Unclear	Yes	Unclear	Yes	Unclear
Marshall et al.2	Unclear	Unclear	Unclear	Yes	Unclear	Yes	Unclear
Prokakis et al.17	Unclear	Yes	Unclear	Yes	Yes	Yes	Unclear

κ = 0.70.