Additional file 1: of Factors associated with prolonged length of stay for elective hepatobiliary and neurosurgery patients: a retrospective medical record review LeeSiu LeeSoo-Hoon TanJenny FooHoward PhanPhillip KowAlfred LwinSein SeahPenelope MordiffiSiti 2018 Median LOS in days according to surgical complexity. (DOCX 19 kb)