Title Search [BP OP 1-1] Risk factor of delayed hepaticojejunostomy site stricture in pylorus preserving pancreaticoduodenectomy and its predicting nomogram Seoung Yoon RHO (Yonsei University College of Medicine, Korea) [BP OP 1-2] Propensity-score matching analysis of postoperative outcome including quality of life after single incision versus multiport laparoscopic cholecystectomy: A nationwide prospective multicenter study in Korea Dae Joon PARK (Samsung Medical Center, Korea) [BP OP 1-3] Diagnostic Value of Serum Tumor Markers (Carcinoembryonic Antigen and Carbohydrate Antigen 19-9) in Gallbladder Cancer Suyoung HONG (Seoul National University College of Medicine, Korea) [BP OP 1-4] ROBOTIC SURGERY FOR GALL BLADDER CANCER: OPERATIVE TECHNIQUE AND EARLY OUTCOMES Shraddha PATKAR (Tata Memorial Hospital, India) [BP OP 1-5] Fluorescence cholecysto-cholangiography through direct injection with indocyanine green during laparoscopic cholecystectomy Tae yoon LEE (The Catholic University of Korea Seoul St. Mary's Hospital, Korea) [BP OP 1-6] Treatment of Resectable Hilar Cholangiocarcinoma: A Choice of Right- or Left-side Hepatectomy Hye-Sung JO (Korea University College of Medicine, Korea) [BP OP 1-7] Robotic Hilar cholangiocarcinoma Radical Resection compared with Laparotomy in prognosis Sai CHOU (Chinese PLA General Hospital, Beijing, China)