The ability of branched-chain amino acid-to-tyrosine ratio (BTR) to assess preoperative liver function of patients with hepatocellular carcinoma - Akihiko Takagi; Akitsugu Fujita; Satoshi Tokuda; Shunsuke Tamura; Eiji Nakatani; Hideyuki Kanemoto; Noriyuki Oba (PLoS ONE, 2026)