Nomogram for preoperative estimation of microvascular invasion risk in hepatocellular carcinoma oleh Xiao-Wen Huang, Yan Li, Li-Na Jiang, Bo-Kang Zhao, Yi-Si Liu, Chun Chen, Dan Zhao, Xue-Li Zhang, Mei-Ling Li, Yi-Yun Jiang, Shu-Hong Liu, Li Zhu, Jing-Min Zhao