Survival analysis of laparoscopic surgery and open surgery for hilar cholangiocarcinoma: a retrospective cohort study.

"Declarations Ethics approval and consent to participateThis study was performed in line with the principles of the Declaration of Helsinki and approved by the Ethics Committee of the Affiliated Hospital of North Sichuan Medical College (no. 2022ER278-1). According to national laws and institutional requirements, this study did not require written informed consent.As this study was retrospective, according to national laws and institutional requirements, written informed consent was not required. Consent to publicationThe patients signed informed consent regarding the publication of their data. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This study was funded by the National Health Commission of China (no. WA2021RW26) and the Nanchong Municipal School Science and Technology Strategic Cooperation Project (no. 18SXHZ0186)."