Effect of thoracic epidural anesthesia on postoperative outcome in major liver surgery: a retrospective cohort study.

"Declarations Ethics approval and consent to participateThe ethics committee approved the study and waived the need to obtain informed consent for collection, analysis, and publication of data for this retrospective cohort study (Name and address of ethics committee: Ethikkommission der Ärztekammer Hamburg, Weidestraße 122 b, 22083 Hamburg, Germany; President of ethics committee: Prof. Dr. med. M. Carstensen; Process No. WF-022/17; Date of approval: 04/26/2017). Competing interestsConstantin J. C. Trepte has received honorary for lectures by Maquet. All other authors declare no competing interest. Competing interests Constantin J. C. Trepte has received honorary for lectures by Maquet. All other authors declare no competing interest."

"Funding Open Access funding enabled and organized by Projekt DEAL."