Inclusion criteria for selected studies were: (1) Studies written in English language; and (2) Studies analyzing postoperative hypophosphatemia as a prognostic factor for PHLF, overall postoperative morbidity and liver regeneration (patients after different types of liver resections, including living-donor liver donation). Exclusion criteria were as follows: (1) Abstracts, case reports, editorials, letters, systematic reviews and meta-analyses; (2) Studies with incomplete data for further analysis (studies with no reported postoperative complications or phosphorus, studies analyzing postoperative hypophosphatemia in liver transplant recipients); (3) Duplicate studies; and (4) Studies in languages other than English.