Title Search [LV SY 4-1] Difficulty scoring system to guide safe laparoscopic liver resection Jai Young CHO (Surgery, Seoul National University Bundang Hospital, Korea, ) [LV SY 4-2] How to reduce bile leakage and bleeding Yuta ABE (Keio University, Department of Surgery, Japan, ) [LV SY 4-3] Tips for liver hanging maneuver for safe laparoscopic anatomical liver resection Ji Hoon KIM (Department of Surgery, Eulji University Hospital, Daejeon, Korea, ) [LV SY 4-4] Stepwise approach for extended indication: from minor to major laparoscopic liver resection Yang Seok KOH (General surgery, Chonnam National University, Korea, )