Angiopoietin-2 induces angiogenesis via exosomes in human hepatocellular carcinoma oleh Ji-yan Xie, Jin-xing Wei, Li-hong Lv, Qing-fang Han, Wei-bang Yang, Guo-lin Li, Pan-xia Wang, Shao-bin Wu, Jin-xin Duan, Wen-feng Zhuo, Pei-qing Liu, Jun Min