ASO Author Reflections: Albumin-Bilirubin Grade is an Independent Prognostic Factor Complementary to CA19-9 for Pancreatic Cancer Patients. - Imamura T; Okamura Y; Sugiura T; Yamamoto Y; Ito T; Ashida R; Ohgi K; Ohtsuka S; Uesaka K (Annals of surgical oncology, 2021)