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Cumulative failure (CF) rate of cannulation of an intact sphincter of Oddi at 238 sequential endoscopic retrograde cholangio-pancreatographies (ERCP) by a single trainee from June 2006 to May 2008. CF acceptable rate set at 0.20, CF unacceptable failure rate set at 0.35. Type 1 and II error rates set at 0.10
