The secondary outcome measures are recurrence rate of acute pancreatitis, severity of recurrent pancreatitis,20 readmission, performance of additional invasive procedures (eg, cholecystectomy, endoscopic sphincterotomy), complications of EUS and of additional interventions, according to the Clavien-Dindo classification,24 length of hospital stay, quality of life, mortality and costs. Relevant definitions are reported in online supplementary additional file 2.
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