Preoperative prediction of intrahepatic cholangiocarcinoma lymph node metastasis by means of machine learning: a multicenter study in China oleh Tingfeng Huang, Hongzhi Liu, Zhaowang Lin, Jie Kong, Kongying Lin, Zhipeng Lin, Yifan Chen, Qizhu Lin, Weiping Zhou, Jingdong Li, Jiang-Tao Li, Yongyi Zeng