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)