Title Search [BP OP 2-1] Clinicopathologic characteristics of intraductal papillary neoplasm of bile duct (IPNB) after central review: Korean multi-center collaboration study Jae Ri KIM (Seoul National University Hospital, Korea) [BP OP 2-2] 16S rDNA microbiome composition pattern analysis as a diagnostic biomarker for biliary tract cancer Huisong LEE (Ewha Womans University College of Medicine, Korea) [BP OP 2-3] The availability of limited hepatectomy with pd for diffuse perihilar cholangiocarcinoma Ryusei MATSUYAMA (Yokohama City University Graduate School of Medicine, Japan) [BP OP 2-4] Prevalence and clinical significance of biliary intraepithelial neoplasia in cholangiocarcinoma Young-Dong YU (Korea Univeristy College of Medicine, Korea) [BP OP 2-5] Photodocumentation of the critical view of safety: Retrospective comparison study between needlescopic grasper assisted single incision laparoscopic cholecystectomy and three port laparoscopic cholecystectomy Suk Hyun Cho (Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Korea) [BP OP 2-6] Achieving margin negative resection - doing less is justified: Oncological outcomes of wedge excision of liver in gall bladder cancer (GBC) surgery Krunal KHOBRAGADE (Tata Memorial Hospaital, Parel, India) [BP OP 2-7] The current educational status of korean hepatobiliary and pancreatic surgical fellows Jun Suh LEE (Incheon St. Mary's Hospital, College of Medicine, Catholic University, Korea)