Definitions and surgical technique
Definitions were adopted from the Brisbane 2000 Guidelines for liver
anatomy[16]. Resection of ≥3 segments was defined as major
resection. The Clavien–Dindo classification was used to grade
postoperative complications[17]. Major complications were defined as
≥class 3 complications. The definition of bile leakage and
post-hepatectomy liver failure was adopted from the International Study
Group of Liver Surgery[18, 19]. The favorable tumor locations were
defined as segments S2, S3, S4b, S5, and S6 and the unfavorable tumor
locations were defined as segments S1, S4a, S7, and S8. The surgical
technique of OH and LH was mentioned in our previous study[9].