Laparoscopic versus open major liver resection for hepatocellular carcinoma: systematic review and meta-analysis of comparative cohort studies oleh Zi-Yu Wang, Qing-Lian Chen, Ling-Ling Sun, Shu-Ping He, Xiao-Fen Luo, Li-Shuang Huang, Jun-Hai Huang, Cheng-Ming Xiong, Chong Zhong