Evaluation of unexplained acute and acute recurrent pancreatitis using endoscopic retrograde cholangiopancreatography, sphincter of Oddi manometry and endoscopic ultrasound - Coyle,W.J.; Pineau,B.C.; Tarnasky,P.R.; Knapple,W.L.; Aabakken,L.; Hoffman,B.J.; Cunningham,J.T.; Hawes,R.H.; Cotton,P.B. (Endoscopy, 2002)