Quality Assessment in Endoscopic Retrograde Cholangiopancreatography(ERCP)

The investigators will prospectively collect patient and procedure-related data in an observational study in order to detect patient and procedure-related risk factors for poor outcome (i.e. technical failure of the procedure; procedure-related complications). Data will be prospectively reported using standard report forms and patients will be followed up to 30 days to detect late-onset complications.