Byline: Jiong-Jie Yu (a,b,1), Ju-Dong Li (a,b,1), Xin-Fei Xu (a,b,1), Tian Yang [email@example.com] (a,*) Highlights * Propensity score matching analysis in this study is wanted to balance the significant differences in enrollment. * More characteristics variables could be discussed in this study to increase the reliability and accuracy of the conclusion. * Due to irrational category of operations which may confuse the readers, more accurate category and elaboration are need. Author Affiliation: (a) Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai, 200438, China (b) Department of Clinical Medicine, Second Military Medical University, Shanghai, 200433, China * Corresponding author. Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, 225 Changhai Road, Shanghai 200438, China. Article History: Received 7 March 2018; Accepted 12 March 2018 (footnote)1 These authors contribute equally to this work.