Preoperative risk score for prediction of long-term outcomes after hepatectomy for intrahepatic cholangiocarcinoma: report of a collaborative, international-based, external validation study - Brustia, Raffaele; Langella, Serena; Kawai, Takayuki; Fonseca, Gilton Marques; Schielke, Astrid; Colli, Fabio; Resende, Vivian; Fleres, Francesco; Roulin, Didier; Herman, Paulo (Ejso, 2020)