著者名,タイトル,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Kawaguchi Y,Difficulty of laparoscopic liver resection: proposal for a new classification,Ann Surg,,,2017,26,,13,https://cir.nii.ac.jp/crid/1370848654816252821,