Endoscopic sphincterotomy plus large-balloon dilation vs endoscopic sphincterotomy for choledocholithiasis: A meta-analysis

Table 1 Characteristics of the included randomized controlled trials (according to the Cochrane Collaboration’s tool for assessing risk of bias)

Ref.	Sequence generation	Allocation concealment	Blinding of participants	Incomplete outcome	Selective outcome	Other sources of bias
Heo et al[22] 2007	Computer random number generator	Sealed envelope	Outcome assessment blinded	No missingoutcome data	All prespecifiedoutcomes reported	No
Hong et al[11] 2009	Unclear	Not reported	Unclear	No missingoutcome data	All prespecifiedoutcomes reported	No
Kim et al[23] 2009	The order of the procedure	Not reported	Unclear	No missingoutcome data	All prespecifiedoutcomes reported	No
Kim et al[12] 2009	Unclear	Not reported	Unclear	No missingoutcome data	All prespecifiedoutcomes reported	No
Stefanidis et al[24] 2011	Random number table	Sealed envelope	Outcome assessment blinded	No missingoutcome data	All prespecifiedoutcomes reported	No
Teoh et al[13] 2013	Computer random number generator	Sealed envelope	Outcome assessment blinded	No missingoutcome data	All prespecifiedoutcomes reported	No