Enrollment and patient characteristics

Of 809 patients who were screened, 551 (68.1 %) were enrolled after providing written informed consent to participate in the study. Reasons for nonparticipation are summarized in

Patient flow through the study.

Of the 551 patients (mean age 59.9 years) who had a procedure, 281 (51.0 %) were male and 332 (60.3 %) had a prior ERCP (
