TED】ニコライ・ベッグ。手術で最も危険な瞬間の一つを治す道具 (Nikolai Begg: A tool to fix one of the most dangerous moments in surgery) (【TED】Nikolai Begg: A tool to fix one of the most dangerous moments in surgery (Nikolai Begg: A tool to fix one of the most dangerous moments in sur