The reliability of EUS for the diagnosis of chronic pancreatitis: interobserver agreement among experienced endosonographers - Wallace,M.B.; Hawes,R.H.; Durkalski,V.; Chak,A.; Mallery,S.; Catalano,M.F.; Wiersema,M.J.; Bhutani,M.S.; Kochman,M.L.; Gress,F.G.; Van Velse,A.; Hoffman,B.J. (Gastrointest Endosc, 2001)