Early precut sphincterotomy and the risk of endoscopic retrograde cholangiopancreatography related complications: An updated meta-analysis

Table 2 Study characteristics of randomized controlled trials

Ref.	Country	Center involved	No. of patients screened	Patients allocated to early precut/persistent attempts
Tang et al[10]	Canada	Single center	642	32/30
Zhou et al[19]	China	Single center	948	43/48
de Weerth et al[12]	Germany	Single center	291	145/146
Khatibian et al[18]	Iran	Single center	242	106/112
Manes et al[20]	Italy	Multicenter	1654	80/78
Cennamo et al[11]	Italy	Single center	1078	36/110
Swan et al[14]	Australia	Single center	464	39/34