Impact of tumor size on the difficulty of laparoscopic major hepatectomies: an international multicenter study - Kato, Yutaro; Sugioka, Atsushi L; Kojima, Masayuki; Syn, Nicholas; Zhongkai, Wang; Liu, Rong; Cipriani, Federica L; Armstrong, Thomas; Aghayan, Davit; Herman, Paulo (Annals of surgical oncology, 2023)