Title Search [OP 5-1] Use of real-time mixed reality intraoperative navigation with microsoft hololens 2 in complex liver surgery Gianluca ROMPIANESI (Federico II University Hospital, Italy) [OP 5-2] Development and validation of a difficulty scoring system of laparoscopic liver resection for hepatolithiasis Yeongsoo JO (Seoul National University, Korea) [OP 5-3] Clinicopathological features and long-term outcomes of intraductal papillary neoplasms of the bile duct of the liver: Single-institution experience with 146 patients Shin HWANG (University of Ulsan, Korea) [OP 5-4] Laparoscopic liver resection versus percutaneous radiofrequency ablation for single small hepatocellular carcinoma (≤3cm): Optimal indication based on the tumor size and the level of PIVKA-II Ji Su KIM (Yonsei University, Korea) [OP 5-5] A prospective study of somatostatin as pharmacologic portal modulation for post-hepatectomy liver failure: A pilot study Hye-Sung JO (Korea University, Korea) [OP 5-6] Pure laparoscopic versus open right hepatectomy in patients with hepatocellular carcinoma: A propensity score-matched analysis Suk Kyun HONG (Seoul National University, Korea) [OP 5-7] Non-invasive biomarkers, FIB-4 and APRI index, as predictors for prognosis of hepatocellular carcinoma patients after curative hepatectomy Sang Oh YUN (Sungkyunkwan University, Korea)