A Retrospective Comparison of Three Patient-Controlled Analgesic Strategies: Intravenous Opioid Analgesia Plus Abdominal Wall Nerve Blocks versus Epidural Analgesia versus Intravenous Opioid Analgesia Alone in Open Liver Surgery. - Tsai HI; Lu YC; Zheng CW; Yu MC; Chou AH; Lee CH; Kou HW; Lin JR; Lai YH; Chang LL; Lee CW (Biomedicines, 2022)