Inclusion criteria Adult men and women (≥18 years), who undergo liver surgery and are cared for by the interprofessional treatment team in accordance with the ERAS® treatment pathway in one Austrian hospital.

Benign tumors -Hepatocellular adenomas -Hemangiomas -Focal Nodular hyperplasia Primary liver tumors -Hepatocellular carcinoma -Intrahepatic cholangiocellular carcinoma -Perihilar cholangiocarcinoma (Klatskin Tumor) Secondary liver tumors -Colorectal liver metastases -Neuroendocrine liver metastases -Non-colorectal/non-neuroendocrine liver metastases

Elective liver surgery -Resection of liver metastases -Wedge resection -Atypical resection -Left/right hemihepatectomy -Extended hemihepatectomy left/right -Mesohepatectomy

Surgical approach -Open -Minimally invasive (laparoscopic or robotic) -Converted from minimally invasive to open

Exclusion criteria

Combined surgery of multiple organs (e.g., surgery for primary rectal cancer and removal of colorectal liver metastases at the same time)

Additionally for part 1 (retrospective qualitative content analysis) -Missing data: no follow-up telephone call -Missing data: no postoperative care by ERAS Nurse

Additionally for part 2 (prospective questionnaire survey) -Lack of informed consent of the patients for the prospective study -Withdrawal of participation: If consent is withdrawn during the course of the study, the corresponding case is excluded from the data analysis