OC.11.6: Direct Peroral Cholangioscopy in the Evaluation of Common Bile Duct Clearance after Endoscopic Management of Difficult Biliary Stones: Preliminary Results of a Pilot Study. (15th March 2017) - Fugazza, A.; Anderloni, A.; Maselli, R.; Carrara, S.; Di Leo, M.; Ferrara, E.; Galtieri, A.; Lollo, G.; Auriemma, F.; Semeraro, R.; Amvrosiadis, G.; Repici, A.